Data Service Unit Part Number 1200037L1 Document Number

DSU III DBUData Service UnitPart Number 1200037L1Document Number 61200037L1-20A

January 2000

Part Number Version

1200037L1 Switched 4-Wire Version

1202037L1 Switched 4-Wire Version Second Generation

1200037L2 V.32 Version

1202037L2 V.32 Version Second Generation

1200037L3 Switched 2-Wire Version

1202037L3 Switched 2-Wire Version Second Generation

1200037L4 ISDN Version

1202037L4 ISDN Version Second Generation

1202037L5 V.34 Version

Trademarks:

DATAPATH is a registered trademark of CAE Electronics and is usedby Northern Telecom under license.

Hayes is a registered trademark of Hayes Microcomputer Products,Inc.

901 Explorer BoulevardP.O. Box 140000

Huntsville, AL 35814-4000(256) 963-8000

© 2000 ADTRAN, Inc.All Rights Reserved.

Printed in U.S.A.

Notes provide additional useful information.

Cautions signify information that could prevent serviceinterruption.

Warnings provide information that could prevent dam-age to the equipment or endangerment to human life.

iii

IMPORTANT SAFETY INSTRUCTIONSSave These Instructions

When using your telephone equipment, please follow these basic safe-ty precautions to reduce the risk of fire, electrical shock, or personal in-jury:1. Do not use this product near water, such as near a bath tub, wash

bowl, kitchen sink, laundry tub, in a wet basement, or near aswimming pool.

2. Avoid using a telephone (other than a cordless-type) during anelectrical storm. There is a remote risk of shock from lightning.

3. Do not use the telephone to report a gas leak in the vicinity of theleak.

4. Use only the power cord, power supply, and/or batteries indicat-ed in the manual. Do not dispose of batteries in a fire. They mayexplode. Check local codes for any special disposal instructions.

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FCC regulations require that the following information be pro-vided in this manual:

1. This equipment complies with Part 68 of the FCC rules. On thebottom of the equipment housing is a label that shows the FCCregistration number and Ringer Equivalence Number (REN) forthis equipment. If requested, provide this information to the tele-phone company.

2. If this equipment causes harm to the telephone network, the tele-phone company may temporarily discontinue service. If possible,advance notification is given; otherwise, notification is given assoon as possible. The telephone company will advise the custom-er of the right to file a complaint with the FCC.

3. The telephone company may make changes in its facilities, equip-ment, operations, or procedures that could affect the proper oper-ation of this equipment; advance notification and the opportunityto maintain uninterrupted service is given.

4. If experiencing difficulty with this equipment, please contactADTRAN for repair and warranty information. The telephonecompany may require this equipment to be disconnected from thenetwork until the problem is corrected or it is certain the equip-ment is not malfunctioning.

5. This unit contains no user serviceable parts.6. An FCC compliant telephone cord with a modular plug is provid-

ed with this equipment. This equipment is designed to be connect-ed to the telephone network or premises wiring using an FCCcompatible modular jack, which is Part 68 compliant.

7. The following information may be required when applying to thelocal telephone company for leased line facilities.

Service Type Digital FacilityInterface Code

Service OrderCode

NetworkJacks

2.4 kbps Digital Interface 04DU5-24 6.0F RJ-48S4.8 kbps Digital Interface 04DU5-48 6.0F RJ-48S9.6 kbps Digital Interface 04DU5-96 6.0F RJ-48S19.2 kbps Digital Interface 04DU5-19 6.0F RJ-48S38.4 kbps Digital Interface 04DU5-38 6.0F RJ-48S56 kbps Digital Interface 04DU5-56 6.0F RJ-48S64 kbps Digital Interface 04DU5-64 6.0F RJ-48S

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8. The following information may be required when applying to thelocal telephone company for a dial-up line for the V.34 or V.32:

9. The REN us useful in determining the quantity of devices youmay connect to your telephone line and still have all of those de-vices ring when your number is dialed. In most areas, the sum ofthe RENs of all devices should not exceed five. To be certain of thenumber of devices you may connect to your line as determined bythe REN, call your telephone company to determine the maxi-mum REN for your calling area.

10. This equipment may not be used on coin service provided by thetelephone company. Connection to party lines is subject to statetarriffs. (Contact your state public utility commission or corpora-tion commission for information.)

Service Type REN FIC USOCLoop Start (V.32) 0.3B 02LS2 RJ-11CLoop Start (V.34) 0.8B 02LS2 RJ-11C

vi

FEDERAL COMMUNICATIONS COMMISSION RADIOFREQUENCY INTERFERENCE STATEMENT

This equipment has been tested and found to comply with the limitsfor a Class A digital device, pursuant to Part 15 of the FCC Rules.These limits are designed to provide reasonable protection againstharmful interference when the equipment is operated in a commercialenvironment. This equipment generates, uses, and can radiate radiofrequency energy and, if not installed and used in accordance with theinstructions, may cause harmful interference to radio frequencies. Op-eration of this equipment in a residential area is likely to cause harm-ful interference in which case the user will be required to correct theinterference at his own expense.

CANADIAN EMISSIONS REQUIREMENTS

This digital apparatus does not exceed the Class A limits for radionoise emissions from digital apparatus as set out in the interference-causing equipment standard entitled "Digital Apparatus," ICES-003 ofthe Department of Communications.

Cet appareil nuerique respecte les limites de bruits radioelectriquesapplicables aux appareils numeriques de Class B prescrites dans lanorme sur le materiel brouilleur: "Appareils Numeriques," NMB-003edictee par le ministre des Communications.

Shielded cables must be used with this unit to ensurecompliance with Class A FCC limits.

Changes or modifications to this unit not expressly ap-proved by ADTRAN will void the user's authority tooperate the equipment.

vii

CANADIAN EQUIPMENT LIMITATIONS

Notice: The Canadian Industry and Science Canada label identifiescertified equipment. This certification means that the equipmentmeets certain telecommunications network protective, operational,and safety requirements. The Department does not guarantee theequipment will operate to the user’s satisfaction.

Before installing this equipment, ensure that it is permissible to be con-nected to the facilities of the local telecommunications company. Theequipment must also be installed using an acceptable method of con-nection. In some cases, the company’s inside wiring associated with asingle-line individual service may be extended by means of a certifiedconnector assembly (telephone extension cord). Compliance with theabove conditions may not prevent degradation of service in some sit-uations.

Repairs to certified equipment should be made by an authorized Ca-nadian maintenance facility designated by the supplier. Any repairsor alterations made by the user to this equipment, or equipment mal-functions, may give the telecommunications company cause to re-quest the user to disconnect the equipment.

Users should ensure for their own protection that the electrical groundconnections of the power utility, telephone lines, and internal metallicwater pipe system, if present, are connected together. This precautionmay be particularly important in rural areas.

The Load Number (LN) assigned to each terminal device denotes thepercentage of the total load to be connected to a telephone loop whichis used by the device, to prevent overloading. The termination on aloop may consist of any combination of devices subject only to the re-quirement that the total of the Load Numbers of all devices does notexceed 100.

Users should not attempt to make such connectionsthemselves, but should contact the appropriate electricinspection authority, or an electrician, as appropriate.

viii

ISDN Service Ordering Information for the ADTRAN DSU III DBUDial Backup

For ADTRAN DSU III DBU ISDN applications, the following guidecan be used as an aid in ordering basic ISDN service from your localtelephone company. The ADTRAN DSU III DBU ISDN includes NT1and Terminal adapter functionality and supports data rates up to 64kpbs.

Request that the ISDN line allocate one DYNAMIC Terminal End-point Identifier (TEI) for the number.

Request an ISDN Basic Rate Interface (BRI) line with the followingfeatures:

U-interface reference point2B1Q line coding1B+D Service (supports up to 64 kbps)

The DSU III DBU ISDN supports the following switch types andsoftware protocols:

AT&T 5ESS Custom, 5E6 and later software, NationalISDN-1

NT1 DMS-100 BCS-32 and later software (Pvc1), NationalISDN-1 (Pvc2)

Siemens EWSD National ISDN-1

For service offered from an AT&T 5ESS, request a point-to-pointline with the following features:

Feature: ValueB1 Service: On Demand (DMD)Data Line Class:Point-to-PointMaximum B Channels: 1 (1B+D)Circuit Switched Data (CSD) Bearer Channels: AnyNumber of CSD Calls: 1 (1B+D)Terminal Type: Type A

ix

Turn the following features off:

Packet Mode DataMulti-line HuntMultiple Call AppearancesElectronic Key Telephone Sets (EKTS)Shared Dictionary NumbersAccept Special Type of NumberIntercom GroupsNetwork Resource Selector (Modem Pools)Message WaitingHuntingInterLata Competition

For service offered from a Northern Telecom DMS-100, request aPoint-to-Point Multi-Point line with the following features:

Line Type: Basic Rate, FunctionalElectronic Key Telephone Sets (EKTS): NoCall Appearance Handling (CACH): NoNon-Initializing Terminal: NoCircuit Switched Service: YesPacket Switched Service: NoTEI: DynamicBearer Service: Circuit Switched voice and data permitted on any Bchannel (packet mode data not permitted)

x

WARRANTY AND CUSTOMER SERVICE

ADTRAN will replace or repair this product within five years fromthe date of shipment if it does not meet its published specifications orfails while in service. For detailed warranty, repair, and return infor-mation refer to the ADTRAN Equipment Warranty and Repair andReturn Policy Procedure.Return Material Authorization (RMA) is required prior to returningequipment to ADTRAN.

For service, RMA requests, or further information, contact one of thenumbers listed in the back of this manual.

xi

LIMITED PRODUCT WARRANTY

ADTRAN warrants that for ten (10) years from the date of shipmentto Customer, all products manufactured by ADTRAN will be freefrom defects in materials and workmanship. ADTRAN also warrantsthat products will conform to the applicable specifications anddrawings for such products, as contained in the Product Manual or inADTRAN's internal specifications and drawings for such products(which may or may not be reflected in the Product Manual). Thiswarranty only applies if Customer gives ADTRAN written notice ofdefects during the warranty period. Upon such notice, ADTRANwill, at its option, either repair or replace the defective item. IfADTRAN is unable, in a reasonable time, to repair or replace anyequipment to a condition as warranted, Customer is entitled to a fullrefund of the purchase price upon return of the equipment toADTRAN. This warranty applies only to the original purchaser andis not transferable without ADTRAN's express written permission.This warranty becomes null and void if Customer modifies or altersthe equipment in any way, other than as specifically authorized byADTRAN.

EXCEPT FOR THE LIMITEDWARRANTY DESCRIBED ABOVE,THE FOREGOING CONSTITUTES THE SOLE AND EXCLUSIVEREMEDY OF THE CUSTOMER AND THE EXCLUSIVE LIABILITYOF ADTRAN AND IS IN LIEU OF ANY AND ALL OTHER WAR-RANTIES (EXPRESSED OR IMPLIED). ADTRAN SPECIFICALLYDISCLAIMS ALL OTHER WARRANTIES, INCLUDING (WITHOUTLIMITATION), ALL WARRANTIES OF MERCHANTABILITY ANDFITNESS FOR A PARTICULAR PURPOSE. SOME STATES DO NOTALLOW THE EXCLUSION OF IMPLIEDWARRANTIES, SO THISEXCLUSION MAY NOT APPLY TO CUSTOMER.

In no event will ADTRAN or its suppliers be liable to Customer forany incidental, special, punitive, exemplary or consequential dam-ages experienced by either Customer or a third party (including, butnot limited to, loss of data or information, loss of profits, or loss ofuse). ADTRAN is not liable for damages for any cause whatsoever(whether based in contract, tort, or otherwise) in excess of the amountpaid for the item. Some states do not allow the limitation or exclusionof liability for incidental or consequential damages, so the above limi-tation or exclusion may not apply to Customer.

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Table of Contents

Chapter 1. IntroductionpRoduct Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1DDS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3Dial Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Dial Backup Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44-Wire Switched 56 Backup Option . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42-Wire Switched 56 Backup Option . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

V.32 bis Backup Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4V.34 Backup Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51B+D Basic Rate ISDN Backup Option . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Entering Dial Backup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Operation During Critical Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Loss of Sealing Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Out of Service (OOS) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6No Receive Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6All 1s or all 0s Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Operation During Noncritical Times . . . . . . . . . . . . . . . . . . . . . . . . . 1-6Conditions for Returning to the DDS Circuit . . . . . . . . . . . . . . . . . . . . 1-6

Chapter 2. InstallationUnpack, Inspect, Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Receipt Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1ADTRAN Shipments Include . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Customer Provides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2Network Interface Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2DTE Data Connection/Primary DTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Secondary Channel Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Configuration Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

V.25 bis Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8SDLC Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

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Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9

Bi-Sync Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9

Asynchronous Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9

Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10Syntax and Possible Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

CNL (Configuration Local) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10CNR (Configuration Remote) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Remote Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Chapter 3. OperationMenu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2Configuration (CONFIG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Basic Menu Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

LCD Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4Enter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4Numeric Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5Quick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5Cancel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5Up and Down Arrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5LED Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

Chapter 4. Configuration OverviewLocal and Remote Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Chapter 5. Configuring Network OptionsNetwork Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Loop Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3Network Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

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Remote Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Chapter 6. Configuring DTE OptionsDTE OptioNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

DTE Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Connector Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5DTE Command Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6Transmit Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7Clear to Send (CS) Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8Anti-Stream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10CD Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11Data Terminal Ready (TR) Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12Data Set Ready (SR) Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13Secondary Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Chapter 7. Configuring Test OptionsTest Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Test Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Remote Digital Loopback (RDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2EIA LLB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3EIA RLB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3DBU Answer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Chapter 8. Configuring Dial OptionsDial Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Phone Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3ISDN Dial Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Setting the Service Profile Identifier (SPID) . . . . . . . . . . . . . . . . . . 8-3Setting the Local Directory (LOC) Number . . . . . . . . . . . . . . . . . . 8-4

DBU Options for All Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4Automatic DBU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4Number to Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4Originate/Answer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5When Out of Service (OOS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5No Receive (RX) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5No Sealing Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5When all 1s/0s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5Auto Restore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

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Redial Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6Fail Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6Wait to Redial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6

DBU Options for 2-wire and 4-wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8Network Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8

DBU Options for V.32 bis and V.34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8Error Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8

DBU Options for ISDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10Switch Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10

DBU Passcode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10

Chapter 9. Dial Optionsdial Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

Answer Unit Connected to DDS Line . . . . . . . . . . . . . . . . . . . . . . . . .9-2Dial Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2

Originate Unit Connected to DDS Line . . . . . . . . . . . . . . . . . . . . . . . .9-2Dial Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2Stay on Leased . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2DBU Online Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2

Dial Options During Dial Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2Hang Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2Stay On Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3

Chapter 10. StatusStatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

Network Rate, DTE Rate, and Data Format . . . . . . . . . . . . . . . . . . .10-1Dial Backup Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2

Type of Dial Backup Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2Current Status of Dial Backup Mode . . . . . . . . . . . . . . . . . . . . . . .10-2

DSU Operation and Network Status . . . . . . . . . . . . . . . . . . . . . . . . .10-3Current DSU III DBU Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3Current DDS Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-4

DTE Control Leads and Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-4

Chapter 11. Testing and TroubleshootingTEST OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1

Initiating a Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2Test Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-3

xvi DSU III DBU User Manual 61200037L1-20

Table of Contents

Exiting a Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5

Messages from the DSU/CSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5Troubleshooting New Installs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6

Test Sequence for Troubleshooting New Installs or Existing Circuits 11-7Local Unit diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8

DTE & Loop (LL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11

Loop Only (RT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13

DTE Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15

DTE With Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-17

Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-19

Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-20

Remote Unit Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-21Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-22

DBU Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-23Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-23Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-24Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-24

61200037L1-20 DSU III DBU User Manual xvii

Table of Contents

Chapter 12. Manual CommandManual Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1

Appendix A. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Appendix B. Default Configuration Profiles . . . . . . . . . . . . . . . . . . . . B-1

Appendix C. DSU to Modem Interconnect . . . . . . . . . . . . . . . . . . . . . . C-1

Appendix D. EIA-232 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Appendix E. Specifications Summary . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Appendix F. Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

xviii DSU III DBU User Manual 61200037L1-20

List of Figures

Figure 1-1. Typical Point-to-Point Application for DSU III DBU . . . . 1-2Figure 3-1. Example of Basic Menu Navigation . . . . . . . . . . . . . . . . . . 3-3Figure 3-2. DSU III DBU Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Figure 3-3. DSU III DBU Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Figure 5-1. Setting Loop Rate Options . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3Figure 5-2. Setting the Network Address. . . . . . . . . . . . . . . . . . . . . . . . 5-4Figure 5-3. Remote Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4Figure 5-4. Setting the Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5Figure 6-1. Selecting DTE Rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2Figure 6-2. Selecting the Connector Type. . . . . . . . . . . . . . . . . . . . . . . . 6-4Figure 6-3. Selecting Asynchronous or Synchronous Data Format . . 6-5Figure 6-4. Selecting DTE Command Option . . . . . . . . . . . . . . . . . . . . 6-6Figure 6-5. Transmit Clock Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7Figure 6-6. Selecting CS Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8Figure 6-7. Anti-Stream Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10Figure 6-8. Selecting CD Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11Figure 6-9. Selecting Data Terminal Ready (TR) Options . . . . . . . . . 6-12Figure 6-10. Setting Data Set Ready (SR) Options . . . . . . . . . . . . . . . . 6-13Figure 6-11. Setting the Secondary Rate . . . . . . . . . . . . . . . . . . . . . . . . . 6-14Figure 7-1. Setting Test Timeout Option . . . . . . . . . . . . . . . . . . . . . . . . 7-2Figure 7-2. Remote Digital Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Figure 7-3. EIA Local Loopback Options . . . . . . . . . . . . . . . . . . . . . . . . 7-3Figure 7-4. EIA Remote Loopback Options . . . . . . . . . . . . . . . . . . . . . . 7-3Figure 7-5. DBU Answer Test Option. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4Figure 8-1. Dial Backup Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2Figure 8-2. Editing Stored Phone Numbers . . . . . . . . . . . . . . . . . . . . . . 8-3Figure 9-1. Dial Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1Figure 10-1. Status Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1Figure 11-1. Normal Operation Before Initiating Loopback Test . . . . 11-1Figure 11-2. Initiating a Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2Figure 11-3. Sample Test Status Displays. . . . . . . . . . . . . . . . . . . . . . . . 11-3Figure 11-4. Complete Test Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-4

61200037L1-20 DSU III DBU User Manual xix

List of Figures

Figure 11-5. DTE & Loop Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-10Figure 11-6. Initiating a DTE & Loop Test. . . . . . . . . . . . . . . . . . . . . . .11-11Figure 11-7. Loop Only Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12Figure 11-8. Initiating a Loop Only Test . . . . . . . . . . . . . . . . . . . . . . . .11-13Figure 11-9. DTE Only Test Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . .11-14Figure 11-10. Initiating a DTE Only Test . . . . . . . . . . . . . . . . . . . . . . . . .11-15Figure 11-11. DTE with Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-16Figure 11-12. Initiating a DTE Test with Test Pattern . . . . . . . . . . . . . .11-17Figure 11-13. Test Pattern Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18Figure 11-14. Initiating a Test Using a Test Pattern . . . . . . . . . . . . . . . .11-19Figure 11-15. Initiating a Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-20Figure 11-16. V.54 RDL with Test Pattern . . . . . . . . . . . . . . . . . . . . . . . .11-21Figure 11-17. Initiating a Remote Test . . . . . . . . . . . . . . . . . . . . . . . . . . .11-22Figure 11-18. DBU Connection Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-23Figure 11-19. Initiating a DBU Connection Test . . . . . . . . . . . . . . . . . . .11-24Figure 12-1. Manual Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2Figure C-1. DSU to Modem Interconnect . . . . . . . . . . . . . . . . . . . . . . . . C-1Figure D-1. EIA-232 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

xx DSU III DBU User Manual 61200037L1-20

List of Tables

Table 2-1. Pin Assignments for Line 1 Connector . . . . . . . . . . . . . . . . . 2-2Table 2-2. Pin Assignments for Line 2 Connector . . . . . . . . . . . . . . . . . 2-3Table 2-3. Pin Assignments for Primary EIA-232 Connector. . . . . . . . 2-4Table 2-4. Pin Assignments for Primary V.35 Connector . . . . . . . . . . . 2-5Table 2-5. Pin Assignments for Auxiliary EIA-232 Connector . . . . . . 2-6Table 5-1. Network Options AT Commands . . . . . . . . . . . . . . . . . . . . . 5-2Table 6-1. DTE Rate Options AT Commands. . . . . . . . . . . . . . . . . . . . . 6-3Table 6-2. Data Format Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5Table 6-3. Transmit Clock AT Commands . . . . . . . . . . . . . . . . . . . . . . . 6-7Table 6-4. CS options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9Table 6-5. Short and Long Delays at Different Operating Speeds. . . . 6-9Table 6-6. Anti-Stream AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 6-11Table 6-7. CD Options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 6-12Table 6-8. TR Options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 6-13Table 6-9. SR Options AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . . 6-14Table 6-10. Secondary Rate AT Commands . . . . . . . . . . . . . . . . . . . . . . 6-15Table 7-1. Test Options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 7-1Table 8-1. AT Commands for Storing Phone Numbers . . . . . . . . . . . . 8-4Table 8-2. DBU Options AT Commands for All Models . . . . . . . . . . . 8-7Table 8-3. DBU Options AT Commands for V.32 bis and V.34 Backup. 8-9Table 11-1. Messages from the DSU/CSU . . . . . . . . . . . . . . . . . . . . . . . 11-5Table 11-2. Troubleshooting New Installs . . . . . . . . . . . . . . . . . . . . . . . 11-6Table 11-3. Test AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8Table 11-4. DTE With Test Pattern Commands . . . . . . . . . . . . . . . . . . . 11-9Table 11-5. Remote Tests and AT Commands . . . . . . . . . . . . . . . . . . . 11-21Table 12-1. Manual Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3Table A-1. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Table B-1. Default Configuration Profiles . . . . . . . . . . . . . . . . . . . . . . . . B-2

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List of Tables

xxii DSU III DBU User Manual 61200037L1-20

Chapter 1 Introduction

PRODUCT OVERVIEW

The ADTRAN DSU III DBU (dial backup data service unit) provides a re-liable, high-speed data connection for customer data terminal equipment(DTE) through digital data service (DDS) lines. The DSU III DBU providesautomatic dial backup of the dedicated circuit. There are five backup op-tions available: 4-wire switched 56 (SW56), 2-wire SW56, V.32 bis/42 bis,V.34, and 1B+D ISDN. The DSU III DBU supports both synchronous andasynchronous data communication over the DDS or DBU networks.

The DSU III DBU provides both V.35 and EIA-232 electrical and physicalDTE interfaces to accommodate a variety of applications. A second EIA-232 interface is provided if the unit is configured for use on DDS with sec-ondary channel services.

To ensure a reliable connection, the unit features an extended receivercapability which permits operation over long loops (3.4 miles or 5.5 km of26 AWG at 56 kbps).

The 4-wire SW56 DBU model is compatible with AT&T Accunet andSprint SW56 type services. The 2-wire SW56 DBU is compatible withDATAPATH¨ type of SW56 services. The V.32 bis/42 bis DBU and theV.34 DBU allow switched backup over the public switched telephone net-work (PSTN). The 1B+D ISDN model is compatible with National ISDNand supports a U- interface to the Basic Rate ISDN.

Figure 1-1 on page 1-2 shows a typical point-to-point application for theDSU III DBU.

61200037L1-20 DSU III DBU User Manual 1-1

Chapter 1. Introduction

Figure 1-1. Typical Point-to-Point Application for DSU III DBU

DDS OPERATION

DDS is a nationwide service that allows interconnection and transport ofdata at speeds up to 64 kbps. The local exchange carriers provide the localloop service to DDS customers and may provide data for routing Inter-LATA to an interexchange carrier. In DDS mode, the DSU III DBU sup-ports the 56/64 kbps DDS service rate yielding DTE rates of 2.4, 4.8, 9.6,19.2, 38.4 (sync or async), 56 kbps, and 64 kbps. An additional rate of 57.6is available in asynchronous mode. The unit can be configured to runslower DTE rates (async or sync) over the 56 kbps service. Secondarychannel operation is supported at all service rates up to 56 kbps, providingterminal rates of 75, 150, 300, 600, 1200, and 2400 bps. The secondary ratesavailable depend on the service rate configured.

2 or 4-wire SW56

2 or 4-wire SW56

V.32 bis

V.32 bis

DEDICATEDPRIVATE NETWORK

PUBLIC SWITCHEDDIGITAL NETWORK

PUBLIC SWITCHEDTELEPHONE NETWORK

ISDNNETWORK

ENTERENTER 1 2 3

4 5 6

7 8 9

#0*CANCELCANCELSHIFTSHIFT SHIFTSHIFT

D

A

E

B

F

C

RS CS TD RD CD ALM TSTRS CS TD RD CD ALM TST

DSU III DBU

1 16162 3 4 5 6 7 8 9 1010 1111 1212 1313 1414 1515

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

DSU III ARDSU III AR DSU III ARDSU III AR DSU III ARDSU III AR DSU III ARDSU III AR DSU III S4WDSU III S4W DSU III S4WDSU III S4W DSU III S4WDSU III S4W DSU III DBUDSU III DBUDSU III S4WDSU III S4W DSU III DBUDSU III DBU DSU III DBUDSU III DBU DSU III DBUDSU III DBU DSU S2WDSU S2W DSU S2WDSU S2W DSU S2WDSU S2W

POWER SUPPLYPOWER SUPPLY POWER SUPPLYPOWER SUPPLY

DIALDIAL STATUSSTATUS

TESTTEST CONFIGCONFIG ENTERENTER

1 2 3

4 5 6

7 8 9

0

DIALMATEDIALMATE

CANCELCANCEL

SHELFSHELF

CONTROLLERCONTROLLER

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

+5V

+5V

+12V

+12V

-12V

-12V

-5V

-5V

CH

EC

KC

HE

CK

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

RSRS

CSCS

TDTD

RDRD

CDCD

DTEDTE

LOOPLOOP

RDLRDL

PTRNPTRN

ERRORERROR

ALMALM

SELECTSELECT

TESTTEST

+5V

+5V

+12V

+12V

-12V

-12V

-5V

-5V

CH

EC

KC

HE

CK

SERVER

PCs

PRINTER

BRIDGE/ROUTER

LocalAreaNetwork

LocalAreaNetwork

SMART 16 SHELF

DSU III DBU SERVER

PCsPRINTER

BRIDGE/ROUTER

1-2 DSU III DBU User Manual 61200037L1-20


DIAL BACKUP OPERATION

There are five backup options available: 4-wire SW56, 2-wire SW56, V.32bis/42 bis,V.34, and 1B+D ISDN. Contact the local telco provider to deter-mine which services are available.

Dial Backup Options

4-Wire Switched 56 Backup Option

This dial-up 4-wire DDS allows customers to pay for data connection onlyfor the time the unit is active. The regional operating companies providethe 4-wire local loop service to SW56 customers. In SW56 mode, the DSUIII DBU supports DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (asynchronous or syn-chronous), and 56 kbps (synchronous). An additional DTE rate of 57.6kbps is available in async modes.

2-Wire Switched 56 Backup Option

DATAPATH is a switched digital service offered under various servicenames by the local service provider. The services are generally providedby the Northern Telecom DMS/SL100 family of central office switches.DATAPATH allows the customer to pay for high speed data transfer, upto 56 kbps, only when the unit is active. The dial-up service is deliveredvia a 2-wire local loop that can be up to 18,000 feet at a signal level of-45 dB.

V.32 bis Backup Option

The V.32 bis/42 bis modem in an asynchronous mode can use V.42 bisdata compression to make up for a slower connection rate. V.42 bis in-creases the effective data throughput from 14.4 kbps to as high as 57.6kbps, depending on the data type. No compression is supported in syn-chronous operation. In synchronous applications the maximum speedsupported for backup is 14.4 kbps.



V.34 Backup Option

The V.34 modem has all of the V.32 bis modem's modes of operation, plusV.34 and V.FC modes. This allows the V.34 option to run synchronousrates up to 28.8 kbps as opposed to the V.32 at 14.4 kbps. In asynchronousmode the throughput at 57.6 kbps is less dependent on data types.

1B+D Basic Rate ISDN Backup Option

1B+D Basic Rate ISDN service provides the customer with a switched 56/64 kbps circuit. The default data rate for this option is 56K. The 64 kbpsdata rate may be revised by using the SMART dial string as described inthe section ISDN Dial Backup on page 8-3. This option provides a U inter-face to the ISDN network.

Entering Dial Backup Mode

When a condition for entering dial backup mode is detected, the AlarmLED turns on, and the buzzer sounds. The buzzer alternates between 30seconds on and 30 seconds off unless the DDS line is restored or it is dis-abled by using the Quick key and selecting TURN OFF BEEP. See the sectionFront Panel on page 3-4 for more information on the Quick key.

Operation During Critical Times

The following four conditions will cause a DSU III DBU to enter dial back-up mode:

Loss of Sealing Current

Sealing current is a low voltage DC current provided by the central office(CO) to prevent corrosion over the copper wires used in the local loop.Sealing current may also be used for local loop testing purposes. An ab-sence of sealing current generally is an indication that the loop is open.

Out of Service (OOS) Signal

An OOS signal, generated by the network, indicates a device (or devices)in the network is out of service.



No Receive Signal

This is an indication that the local loop copper pairs may be either open orshorted or the OCU in the CO is inoperative. In a private network this mayindicate that the transmitter of the remote DSU is inoperative.

All 1s or all 0s Condition

This condition is usually generated by the network to indicate some device(or devices) in the network is inoperative. Upon detecting an all 1s or all0s condition, the DSU III DBU initiates a handshake routine to determinewhether the remote unit's DTE is the source of the all 1s or 0s condition orif an actual network failure exists.

Operation During Noncritical Times

The DSU III DBU may be configured not to enter dial backup mode if dataterminal ready (DTR) is low. This feature prevents the DSU III DBU fromentering dial backup during noncritical times such as nights and week-ends.

For more information, see the chapter Configuring Dial Options on page 8-1.

Conditions for Returning to the DDS Circuit

The DSU III DBU can be configured to automatically revert to the DDS cir-cuit from the dial backup mode or wait to be returned to the DDS manu-ally. Once the DSU III DBU enters dial backup mode, the unit polls theDDS circuit once every 100 ms to determine if the condition causing theDDS circuit failure has been corrected. Once the DSU III DBU determinesthat the problem has been properly corrected and the DDS circuit is stable,it will wait for the amount of time specified in the restore timer (1 - 255minutes) before reverting to the DDS circuit. Polling of the DDS circuit isnon-intrusive and return to the DDS circuit generally takes 2 - 3 seconds.The backup connection is maintained for one minute after the DDS circuitis restored.

For more information see the chapter Configuring Dial Options on page 8-1.




Chapter 2 Installation

UNPACK, INSPECT, POWER UP

Receipt Inspection

Carefully inspect the DSU III DBU for any shipping damage. If damage issuspected, file a claim immediately with the carrier and contact ADTRANCustomer Service. If possible, keep the original shipping container for usein shipping the DSU III DBU for repair or for verification of damage dur-ing shipment.

ADTRAN Shipments Include

The following items are included in ADTRAN shipments of the DSU IIIDBU:

• DSU III DBU unit• An 8-position modular to 8-position modular cable• The user manual• Appropriate cable for the backup option selected

Customer Provides

The customer must provide an EIA-232 interface cable with standard 25-pin male D-type connectors (Cannon or Cinch DB-19604-432) or a V.35 ca-ble.


Chapter 2. Installation

Power Up

Each DSU unit is provided with a captive eight-foot power cord, terminat-ed by a three-prong plug which connects to a grounded 115 VAC powerreceptacle.

NETWORK INTERFACE CONNECTION

The DSU III DBU has two eight-position modular jacks labelled Line 1 andLine 2. The line 1 connector is used for connecting to the dedicated (DDS)network. The pinout for the line 1 connector is listed in Table 2-1.

The line 2 connector is used for connection to the switched backup net-work. The pinout for the line 2 connector depends on the model of DBUunit. Pinouts for 4-wire Switched 56, 2-wire Switched 56, V.32 bis, V.34,and 1B+D ISDN DBU options are shown in Table 2-2 on page 2-3.

Power to the DSU must be provided from a grounded 115 VAC,60 Hz receptacle.

Table 2-1. Pin Assignments for Line 1 Connector

Pin Name Description

1 R1 Transmit Data from DSU to Network-Ring 1

2 T1 Transmit Data from DSU to Network-Tip 1

3-6 - Not Used

7 T Receive Data from Network to DSU-Tip

8 R Receive Data from Network to DSU-Ring



DTE DATA CONNECTION/PRIMARY DTE

The primary DTE should be connected to either the EIA-232 DTE connec-tor or the CCITT V.35 DTE connector. The maximum cable lengths recom-mended are 50 feet for the EIA-232, and 100 feet for the CCITT V.35. Thepin assignments for the connectors are listed in Table 2-3 on page 2-4 andTable 2-4 on page 2-5.

The V.35 connector is recommended for use with data rates above 19.2kbps. The EIA-232 connector works up to 56 kbps with a low capacitancecable or with the external transmit clock option selected. The primaryDTE rate is configured from the front panel. The primary DTE equipmentcan operate in asynchronous or synchronous modes.

Table 2-2. Pin Assignments for Line 2 Connector

Pin Name Description

4-wire Switched 56

1 R1 Transmit Data from DSU to Network-Ring 1

2 T1 Transmit Data from DSU to Network-Tip 1

3-6 - Not Used

7 T Receive Data from Network to DSU-Tip

8 R Receive Data from Network to DSU-Ring

2-wire Switched 56, V.32 bis, V.34, and 1B+D ISDN

1-3 - Not Used

4 T Network-Tip

5 R Network-Ring

6 - 8 - Not Used

To prevent possible radio frequency interference emissions, ashielded cable is required.



Table 2-3. Pin Assignments for Primary EIA-232 Connector

Pin EIA Description

1 AA Protective Ground (PG)

2 BA Transmit Data (SD)

3 BB Receive Data (RD)

4 CA Request-to-Send (RS)

5 CB Clear-t0-Send (CS)

6 CC Data Set Ready (SR)

7 AB Signal Ground (SG)

8 CF Received Line Signal Detector (CD)

9 - +12 Test Point

10 - -12 Test Point

15 DB Transmit Clock (TC)

17 DD Receive Clock (RC)

18 - Local Loopback (LL)

20 CD Data Terminal Ready (TR)

21 - Remote Loopback (RL)

22 CE Ring Indicator (RI)

24 DA External TX Clock (ETC)

25 - Test Indicator (TI)



Table 2-4. Pin Assignments for Primary V.35 Connector

Pin CCITT Description

A 101 Protective Ground (PG)

B 102 Signal Ground (SG)

C 105 Request to Send (RTS)

D 106 Clear To Send (CTS)

E 107 Data Set Ready

F 109 Received Line Signal Detector (CD)

H - Data Terminal Ready (DTR)

J - Ring Indicator (RI)

L - Local Loopback (LL)

N - Remote Loopback (RL)

R 104 Received Data (RD-A)

T 104 Received Data (RD-B)

V 115 Receiver Signal Element Timing (SCR-A)

X 115 Receiver Signal Element Timing (SCR-B)

P 103 Transmitted Data (SD-A)

S 103 Transmitted Data (SD-B)

Y 114 Transmitter Signal Element Timing (SCT-A)

AA 114 Transmitter Signal Element Timing (SCT-B)

U 113 External TX Signal Element (SCX-A)

W 113 External TX Signal Element (SCX-B)

NN - Test Indicator (TI)



SECONDARY CHANNEL CONNECTION

If used, the secondary DTE should be connected to the auxiliary EIA-232connector. The pinout for the connector is shown in Table 2-5.

Table 2-5. Pin Assignments for Auxiliary EIA-232 Connector

Pin CCITT Description

1 AA Protective Ground (PG)

2 BA Transmit Data (SD)

3 BB Receive Data (RD)

4 CA Request to Send (RS)

5 CB Clear to Send (CS)

6 CC Data Set Ready (SR)

7 AB Signal Ground (SG)

8 CF Carrier Detect (CD) - on all the time



CONFIGURATION

The DSU III contains four different user profiles (sets of configuration op-tions) that are stored in read-only memory. These profiles are listed in theappendix Default Configuration Profiles on page B-1. The unit is shippedfrom the factory with profile 1 (default configuration) loaded into the non-volatile configuration memory. If profile 1 matches the desired system re-quirements, then no additional configuration is required to put the unitinto service. If profile 1 does not match the desired system requirements,modify the default configuration or select another profile more closelymatching the desired configuration and modify.

When a new profile is loaded or the existing profile is modified, it is storedin the nonvolatile configuration memory. The DSU III DBU is then config-ured with that profile every time power is turned on or the unit is reset.

See the chapter Manual Command on page 12-1 for information on loadingdefault configuration profiles.

Configuration Methods

The DSU III DBU provides three methods for local configuration andthree different methods for remote configuration: AT commands, V.25commands, and front panel commands.

AT Commands

In addition to the front panel, the DSU III DBU can be configured and con-trolled with in-band AT commands from an asynchronous DTE port justas modems are.

To exit the data mode and enter the command mode, the asynchronousDTE device must transmit a proper escape sequence of three pluses (+++)to the DSU III DBU. A specified time delay must occur between the lastdata character and the first escape sequence character. This is the guardtime delay, and it can be changed by writing a value to the S12 register.The default value for the guard time is one second. For a valid escape se-quence to occur, the DTE must transmit the escape code character three



times in succession with delay between each character being less than theguard time.

Once the command mode is entered, AT commands can be transmitted tothe DSU III DBU to configure most of the options or initiate tests to checkboth the DSU III DBU and the network connections. All command linesmust begin with the AT character set in either capital or lower case letters.

The command line may contain a single command or a series of com-mands after the AT attention code. When a series of commands is used,the individual commands may be separated with spaces for readability.The maximum length for a command line is 40 characters. Each commandline is executed by the DSU III DBU upon receipt of a terminating charac-ter. The default terminating character is a carriage return (ASCII 013), butit can be changed by writing a different value to register S3.

Before the terminating character is transmitted, the command line can beedited by using the backspace character (ASCII 008) to erase errors so theproper commands can be entered.

Valid AT commands for the DSU III DBU are listed in the appendix ATCommands on page A-1.

V.25 bis Commands

When configured for the V.25 bis option, the DSU III DBU accepts in-banddialing and configuration commands from both synchronous and asyn-chronous DTE ports.

The V.25 bis option supports the following protocols:

• SDLC• Bi-Sync• Asynchronous



SDLC Option

Character Format• Data bits - 8• Parity bit - Ignored

Command Structure

[F][A][C][V.25 bis COMMAND][FCS][F]

The address field [A] is FFH. The control field [C] is set to 13H except forcases of multi-frame responses. For this case, the control field is set to 03Hin all but the last frame. The 03H in the control field indicates that otherframes are to follow while the 13H in the control field indicates the finalframe.

Bi-Sync Option

Character Format• Data bits - 7• Parity bit - Odd

Command Structure

[SYN][SYN][STX][V.25 bis COMMAND][ETX]

Asynchronous Option

Character Format• Start bit- 1• Data bits- 7• Parity bit- Even• Stop bit- 1

Command Structure

[V.25 bis COMMAND][CR][LF]



Command Descriptions

The ADTRAN V.25 bis command set is a subset of the CCITT V.25 bis com-mand set. In addition to the CCITT commands supported, ADTRAN hasadded configuration commands for both local and remote DSUs. TheADTRAN V.25 bis command set follows:

Possible responses to V.25 bis commands follows:

If verbose responses are disabled (ATV0), the following three-character re-sponses are the only ones returned:

Syntax and Possible Responses

CNL (Configuration Local)

This command is used to pass AT commands to the local DSU via the V.25bis command processor. This allows the DSU III DBU to be configuredwith AT commands using a synchronous interface. The format is as fol-lows:

CNL[LOCAL PASSWORD];AT[ONE OR MORE AT COMMANDS]

CNL Configuration localCNR Configuration remote

VALA Valid V.25 command processedINV An invalid command detectedINVCU Unknown command detectedINVPS Invalid parameter syntaxINVPV Invalid parameter valueINVBL Invalid local passwordINVBM Invalid remote password

VAL Valid V.25 command processedINV Invalid command received



A local password may not be required depending on the present configu-ration of the unit. Responses to CNL commands are returned in the dataformat currently configured. Possible responses include: VALA and IN-VAn.

CNR (Configuration Remote)

This command is used to pass AT commands over the network to the re-mote DSU via the V.25 bis command processor. This allows a remote DSUIII DBU to be configured from a synchronous interface. The format of thiscommand follows:

CNR[REMOTE PASSWORD];AT[ONE OR MORE AT COMMANDS]

The remote password may or may not be required depending on thepresent configuration of the remote unit. Responses to the CNR com-mands are returned in the data format currently configured. Possible re-sponses include: VAL and INVAn.

Remote Command

The DSU III DBU can be controlled remotely from another DSU III DBU.The Configuration (CONFIG) menu allows the DSU III DBU remote con-figuration capability to be enabled or disabled. For more information, seethe chapter Configuration Overview on page 4-1.




Chapter 3 Operation

MENU STRUCTURE

The DSU III DBU uses a multilevel menu approach to access its many fea-tures. All menu operations are displayed in the LCD window.

The opening menu is the access point to all other operations. Each MAIN

menu item has several functions and submenus to identify and access spe-cific parameters.

LCD display of the MAIN menu:

Main Menu

There are four branches of the MAIN menu: STATUS, TEST, CONFIGURATION

(CONFIG), and DIAL.

Status

STATUS is used to display all relevant information for the network andDTE interfaces. It displays the current operating data mode, loop status,DTE data rate and format, and DTE interface lead status. The system re-turns to the status display when idle.

Test

TEST is used to control local and remote testing. Select local or remote test-ing, and the type of test and test pattern when required.

1=STATUS 2=TEST3=CONFIG 4=DIAL


Chapter 3. Operation

Configuration (CONFIG)

CONFIGURATION is used to select network and DTE operating parameters.When certain loop rates (56 or 64 kbps) are selected, a scramble option sub-menu is displayed instead of the DTE Rate menu to control scrambling.

Dial

DIAL provides manual dialing functions. Key in a number to dial or selectone of the ten stored numbers.

Basic Menu Navigation

Four function keys on the left side of the DSU III DBU keypad allow thevarious menu branches to be entered, exited, and scrolled through. Thefour function keys are defined below:

To choose a menu item, press the corresponding number or alpha charac-ter on the keypad (press Shift to activate menu items with alpha selec-tions). The item flashes on and off to show it is the currently selected(active) choice. Pressing either the up or down arrows scrolls through theavailable menu items. Press Enter to select the item.

Enter Selects a displayed item.Up Arrow Scrolls up a menu tree.Down Arrow Scrolls down a menu tree.Cancel Exits (back one level) from the current branch of the

menu.



The following example and Figure 3-1 illustrate how to select the DSU IIIDBU loop rate options:

1. Select CONFIGURATION (CONFIG) by pressing 3 and then pressingEnter.

2. Select LOCAL or REMOTE configuration by pressing the correspondingnumber and then pressing Enter.

3. Use the up and down arrows to view submenu items.4. Choose an item on the submenu such as NETWORK OPTIONS (NET-

WORK OPT).5. To select NETWORK OPT press 1 and then press Enter.6. To select LOOP RATE options, press 1 and then press Enter.

Figure 3-1. Example of Basic Menu Navigation

1=LOOP RATE

1=LOCAL 1=NETWORK OPT. 2=-NETWORK ADDR.

3=CONFIG 2=DTE OPTIONS 3=REMOTE CONFIG

2=REMOTE 3=TEST OPTIONS 4=CLOCK SOURCE

4=DIAL OPTIONS

5=MANUAL COMMAND



FRONT PANEL

The DSU III DBU faceplate is shown in Figure 3-2.

Figure 3-2. DSU III DBU Front View

The following function descriptions apply to both the stand-alone unitand the rackmount unit when using the DATAMATE modules.

LCD Window

The LCD window displays menu items and messages in 2 lines by 16 char-acters.

Enter

Enter selects active menu items. To activate a menu item, press the num-ber of the item. When the menu item is flashing (active), press Enter to se-lect it. A submenu item is invoked or a configuration parameter is set.The display of Command Accepted indicates a valid operation.

Numeric Keypad

The numeric keypad contains the numbers 0 through 9 and alpha charac-ters A through F, which are used to activate menu items. Numbers 0through 9 are also used to enter parameters.

DSU III DBU ENTER

CANCEL

1

A

SHIFT QUICK

2

B

3

C

4 5ED

6F

7 8 9

* 0 #

RS CS TD RD CD ALM TST



Shift

Alpha characters are entered by pressing Shift before each desired charac-ter.

To activate a menu item designated by an alpha character rather than anumber, display the menu item using the up and down arrows; press andrelease Shift, then press the letter. Press Enter to select the item.

If a key is pressed without using Shift, the numbered item becomes activeinstead of the alpha item. If this happens, repeat the correct procedure.

Quick

The Quick key used during most operations returns immediately to theMAIN menu. During a test, the Quick key displays the Exit Test screen.During dial backup, Quick displays a menu with options to HANG UP orSTAY ON THE LINE.

Cancel

Cancel stops the current activity and returns to the previous menu. Repeatuntil the desired menu level is reached. When a submenu item is dis-played, press Cancel to exit the current display and return to the previousmenu. Repeat as necessary.

Up and Down Arrows

Up and down arrows scroll through the submenu items available in thecurrent menu. Submenu items appear two at a time in a circular or wrap-ping fashion. When the submenu items are scrolled, they continuouslyappear from beginning to end in a forward (down arrow) or reverse (uparrow) pattern.

LED Description

The DSU III DBU has seven LED indicators: RS, CS, TD, RD, CD, ALM,and TST. These LEDs are identified as follows:



REAR PANEL

The rear panel contains three DTE connectors which provide primarychannel V.35 or EIA-232, and a secondary channel EIA-232 port (auxiliaryEIA-232). An 8-pin telco jack, a captive power cord, and a power switchare also located on the rear panel. Pin assignments for the DTE and net-work connections are listed in the chapter Installation on page 2-1. TheDSU III DBU rear panel is shown in Figure 3-3 on page 3-7.

RS: Request to Send Reflects the status of the request to send pin ofthe EIA-232 connector.

CS: Clear to Send Reflects the status of the clear to send pin ofthe EIA-232 connector.

TD: Transmit Data This LED is active when data is transmittedfrom the DTE.

RD: Receive Data This LED is active when data is received fromthe network.

CD: Carrier Detect This LED is active when framesynchronization is achieved and the DSU IIIDBU is ready to transfer data.

ALM: Alarm Indication This LED activates whenever an alarmcondition exists. Alarm conditions include:• Open loop on network• No frame synchronization• Unit in dial backup• Problem on dial backup line

TST: Test Mode This LED is on whenever the unit is in testmode.



Figure 3-3. DSU III DBU Rear View

Identification of Numbers

Item Function

1. Auxiliary EIA-232 Secondary channel services

2. Power Switch Used to turn power on or off

3. Line 1 Connection to the dedicated circuit

4. Line 2 Connection to dial backup

5. Primary EIA-232 DTE interface

6. Primary V.35 High speed DTE interface

7. 115 VAC Connection Power cord connection

ON

OFF

AUXILIARY EIA-232

PRIMARY EIA-232

115 VAC60HZ .15A

PRIMARY V.35

1 2

3 5 6 7

LINE 2

LINE 1

4




Chapter 4 Configuration Overview

LOCAL AND REMOTE CONFIGURATION

The DSU III DBU can be configured locally using the front panel, or com-munications can be established with a remote DSU so the front panel of thelocal DSU can be used to configure the remote DSU. During remote con-figuration the DSU III DBU prompts for the remote address before dis-playing the CONFIGURATION menus.

The CONFIGURATION menu consists of a group of five submenus relating toa specific interface or function of the DSU III DBU that requires setup:

The DSU III DBU contains four different user profiles (sets of configura-tion options) stored in read only memory; see the appendix Default Config-uration Profiles on page B-1. The unit is shipped from the factory withprofile number 1 (default configuration) loaded into the current (nonvola-tile configuration) memory. If profile 1 matches requirements for the sys-tem, then no additional configuration is required to put the unit intoservice. If profile 1 does not match system requirements it can be modi-fied, or one of the other profiles that more closely matches the system re-quirements can be loaded into current memory. When a different profileis loaded, or the existing profile is modified, it is stored in the current (non-volatile configuration) memory. The DSU III DBU is then configured withthat profile every time power is turned on or until the unit is reset.

1=Network Opt. Network Interface Parameters2=DTE Options DTE Interface Parameters3=Test Options Unit Test Options4=Dial Options Unit Dialing Options5=Manual Command ADTRAN Specific Commands


Chapter 4. Configuration Overview

For detailed information on configuration see the chapters ConfiguringNetwork Options on page 5-1, Configuring DTE Options on page 6-1, Config-uring Test Options on page 7-1, Configuring Dial Options on page 8-1, andManual Command on page 12-1.

A complete CONFIGURATION menu is shown on the enclosed insert.


Chapter 5 Configuring Network Options

NETWORK OPTIONS

The NETWORK OPTIONS configuration parameters control the loop opera-tion of the DSU III DBU.

Once a parameter is set, Command Accepted is displayed briefly beforereturning to the active menu.


Chapter 5. Configuring Network Options

Table 5-1. Network Options AT Commands

Front Panel AT Command

Loop Rate Commands

AUTO no secondary channel %B0

2.4K no secondary channel %B1





56K no secondary channel %B6

64K clear channel %B7

2.4K with secondary channel %B9





56K with secondary channel %B14

Network Address

XX (decimal) _N=xx

Remote Configuration

Disabled &P4

Enabled &P5

Clock Source

Master _X0

From Network _X1



Loop Rate

The LOOP RATE option sets the loop operating speed. The unit should beset to the rate required by the DDS Service. The DSU III DBU also supportssubrate DTE data over a 56 kbps loop. The loop rate must be set indepen-dently of the DTE rate.

Eight loop rate selections are available (shown in Figure 5-1 ). After select-ing any loop rate other than Auto or 64 kbps the option for a secondarychannel is available. The secondary channel rate is determined by the cur-rent loop rate.

Figure 5-1. Setting Loop Rate Options

The DSU III DBU does not support subrates operating over a64 kbps loop rate.

1=AUTO

2=2.4K

3=4.8K

4=9.6K 1=NO SEC. CH.

1=LOOP RATE 5=19.2K 2=SEC. CHANNEL

6=38.4K

7=56K

8=64K

1=NETWORK OPT.

2=NETWORK ADDR

1=LOCAL 3=REMOTE CONFIG.

3=CONFIG 4=CLOCK SOURCE

ENTER 2=DTE OPTIONS

2=REMOTE ADDRESS 3=TEST OPTIONS

4=DIAL OPTIONS

5=MANUALCOMMAND



The default factory setting is AUTO, with no secondary channel. The vari-ous loop rates and format selections are listed in Table 5-1 on page 5-2 withthe equivalent AT commands that perform the same configuration func-tions.

Network Address

A two-digit decimal address can be assigned to each DSU III DBU. Thisaddressing capability makes it possible to perform remote configurationand testing in point-to-point and multi-drop networks. Figure 5-2 showsthe menu path used to change the network address. The factory defaultsetting is 0.

Figure 5-2. Setting the Network Address

Remote Configuration

This option sets up the DSU III DBU to accept or reject remote configura-tion commands. Figure 5-3 on page 5-5 shows the menu path for en-abling/disabling remote configuration. The factory default setting isENABLED.

1=LOOP RATE

1= NETWORK OPT.

ENTER NETWORK

2=NETWORK ADDR ADDRESS:0

1=LOCAL 3=REMOTE CONFIG.

3=-CONFIG 4=CLOCK SOURCE

ENTER 2=DTE OPTIONS

2=REMOTE ADDRESS 3=TEST OPTIONS

4=DIAL OPTIONS

5=MANUAL COMMAND



Figure 5-3. Remote Configuration

Clock Source

The CLOCK SOURCE options specify the timing source for the DSU IIIDBUÕs internal circuitry. The factory default setting is FROM NETWORK

(see Figure 5-4 ).

Figure 5-4. Setting the Clock Source

When operating on a DDS network, the timing should be FROM NETWORK.On a point-to-point private network, one DSU III DBU must be set forMASTER, the others set for FROM NETWORK.

1=LOOP RATE

2=NETWORK ADDR

1=NETWORK OPT.

1=DISABLED

3=REMOTE CONFIG. 2=ENABLED

1=LOCAL 4=CLOCK SOURCE

3=CONFIG 2=DTE OPTIONS

3=TEST OPTIONS

2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS

5=MANUAL COMMAND

1=LOOP RATE

2=NETWORK ADDR

1=NETWORK OPT. 3=REMOTE CONFIG.

1=MASTER

1=LOCAL 4=CLOCK SOURCE 2=FROM NETWORK

3=CONFIG 2=DTE OPTIONS

3=TEST OPTIONS


5=MANUAL COMMAND




Chapter 6 Configuring DTE Options

DTE OPTIONS

The DTE Options menu is used to select the configuration parameters thatcontrol the operation of the DTE Interface of the DSU III DBU.

DTE Rate

The DSU III DBU supports six DTE rates over a 56 kbps circuit with no sec-ondary channel and seven DTE rates over a 64 kbps circuit. If a DTE ratehigher than the current loop rate is selected, the DTE rate automaticallysets to match the slower loop rate; the DSU III DBU briefly displays DTE RATE SAME AS THE NETWORK before returning to the status screen. Thefactory default setting is SAME AS LOOP.


Chapter 6. Configuring DTE Options

Figure 6-1. Selecting DTE Rates

The AT commands for setting the DTE rate options are shown in Table 6-1 on page 6-3.

56 kbps Loop Rate

Secondary Channel

1=SCRAMBLER OFF

1=NETWORK OPT. 2=SCRAMBLER ON

3=DATA INVERT

1=DTE RATE

64 kbps Loop Rate or

56 kbps Loop Rate

No Secondary Channel

1=2.4K

2=DTE OPTIONS 2=4.8K

2=CONNECTOR TYPE 3=9.6K

3=DATA FORMAT 4=19.2K

4=DTE CMD OPTION 5=38.4K

1=LOCAL 5=TRANSMIT CLOCK 6=56K/57.6K 1=SCRAMBLER OFF

6=CS OPTIONS 7=SAME AS LOOP 2=SCRAMBLER ON

3=CONFIG ENTER 7=ANTI-STREAM 3=SUPPRESS LBE

2=REMOTE ADDRESS 8=CD OPTIONS

3=TEST OPTIONS 9=TR OPTIONS

4=DIAL OPTIONS A=SR OPTIONS

5=MANUAL COMMAND B=SECONDARY RATE



If the DSU III DBU is set for a loop rate of 56 kbps secondary channel or 64kbps then scrambler on/off options are available. The factory default set-ting is SCRAMBLER OFF.

Table 6-1. DTE Rate OptionsAT Commands

FrontPanel

ATCommand

Description

1=2.4K %K3 DTE rate: 2.4K sync and async





6=56K/57.6K %K8 DTE rate: 56K sync or 57.6K async

7=SAME AS LOOP %K9 DTE rate matches loop rate

1=SCRAMBLER OFF _F0 DTE data scrambler disabled

2=SCRAMBLER ON _F1 DTE data scrambler enabled

3=DATA INVERT _F2 DTE data invert enabled (56 kbpssecondary channel loop rate only)

3=SUPPRESS LBE _F2 Suppresses loopback enable code(LBE) in transmit data from the DTEafter 30 bytes in a row detected (64 kbpsloop rate only)

For point-to-point operation at 56 kbps with secondary channel,the network requires that the primary and secondary channeldata not be all zeros simultaneously. For HDLC protocolapplications, this constraint can be eliminated by selecting eitherthe DATA INVERT option or the SCRAMBLER ON option.

For 64 kbps clear channel operation, there is a possibility theDTE data sequences might mimic network loop maintenancefunctions and erroneously cause other network elements toactivate loopbacks. To prevent this, the SCRAMBLER ON optionshould be selected for both the local and remote DSU III DBU.



Connector Type

The CONNECTOR TYPE option is used to specify which of the primary chan-nel connectors is used to connect to the DTE. Figure 6-2 shows the menupath used to set the connector type. The factory default setting is V.35.There are no AT commands available to set the connector type.

Figure 6-2. Selecting the Connector Type

1=NETWORK OPT.

1=DTE RATE

2=DTE OPTIONS 1=RS-232

2=CONNECTOR TYPE 2=V.35

1=LOCAL 3=DATA FORMAT

4=DTE CMD OPTION

3=CONFIG 5=TRANSMIT CLOCK

2=REMOTE ENTER ADDRESS 6=CS OPTIONS

7=ANTI-STREAM

8=CD OPTIONS



5=MANUAL COMMAND B=SECONDARY RATE



Data Format

The DATA FORMAT option is used to select either the synchronous or asyn-chronous mode of operation for the DTE interface. The factory default set-ting is SYNCHRONOUS (see Figure 6-3). If ASYNCHRONOUS is chosen, thelength of the data bytes must be selected.

Figure 6-3. Selecting Asynchronous or Synchronous Data Format

Table 6-2 shows the AT commands that can be used to set the DATA FOR-MAT to ASYNCHRONOUS or SYNCHRONOUS.

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE

2=DTE OPTIONS 1=ASYNC 9 BITS

3=DATA FORMAT 1=ASYNCHRONOUS 2=ASYNC 10 BITS

1=LOCAL 3=ASYNC 11 BITS

2=SYNCHRONOUS

3=CONFIG 4=DTE CMD OPTION

2=REMOTE ENTER ADDRESS 5=TRANSMIT CLOCK

6=CS OPTIONS

7=ANTI-STREAM

8=CD OPTIONS

3=TEST OPTIONS

4=DIAL OPTIONS

5=MANUAL

Table 6-2. Data Format Commands

FrontPanel

ATCommand

FrontPanel

1=ASYNCHRONOUS &Q0 1=ASYNCHRONOUS

2=SYNCHRONOUS &Q2 2=SYNCHRONOUS

For asynchronous options, select the length of the data bytes.

1=ASYNC 9 BITS N/A 1=ASYNC 9 BITS





DTE Command Option

The DTE COMMAND option is used to enable AT commands from the DTE,enable V.25 bis (SDLC) commands, enable V.25 (Bisync and Async), or dis-able all DTE command modes (see Figure 6-4).

Figure 6-4. Selecting DTE Command Option

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE

3=DATA FORM,AT

1=DISABLED

2=DTE OPTIONS 4=DTE CMD OPTION 2=AT COMMAND SET

3=V.25 SYNC

1=LOCAL 4=V.25 BSC/ASYNC

3=CONFIG 5=TRANSMIT CLOCK

2=REMOTE ENTER ADDRESS 6=CS OPTIONS

7=ANTI-STREAM

8=CD OPTIONS



5=MANUAL B=SECONDARY RATE



Transmit Clock

The TRANSMIT CLOCK option is used to select the source of the clock usedto transfer data from the DTE into the DSU III DBU. Figure 6-5 shows themenu path used to set the TRANSMIT CLOCK option.

Figure 6-5. Transmit Clock Options

Table 6-3 shows the AT commands used to set the TRANSMIT CLOCK op-tions.

The EXTERNAL clock option is normally used in modem tail circuit appli-cations. A DSU to modem interconnect diagram for this application isshown in the appendix DSU to Modem Interconnect on page C-1.

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE

3=DATA FORMAT

4=DTE CMD OPTION

2=DTE OPTIONS

1=NORMAL

5=TRANSMIT CLOCK 2=EXTERNAL

1=LOCAL

6=CS OPTIONS

3=CONFIG 7=ANTI-STREAM

2=REMOTE ENTER ADDRESS 8=CD OPTIONS


4-DIAL OPTIONS A=SR OPTIONS


Table 6-3. Transmit Clock AT Commands

FrontPanel

ATCommand

Description

1=NORMAL &X0 TX clock from DSU selected

2=EXTERNAL &X1 ETC clock from DTE selected



The EXTERNAL clock option is also recommended when the EIA-232 con-nector is used for 56 kbps and 64 kbps applications. A special DSU cablediagram for this application is shown in the appendix EIA-232 Connectoron page D-1. Using this option and special cable eliminates data errorscaused by excessive delays in the DTE transmit clock receiver and transmitdata driver.

Clear to Send (CS) Options

The CS OPTIONS menu is used to select the control mode for the CS lead.Figure 6-6 shows the menu path used to access the CS OPTIONS menu. Thedefault factory setting is FOLLOWS RS with CS DELAY SHORT.

Figure 6-6. Selecting CS Options

If one of the options chosen involves request to send (RS), then the delayfrom RS to CS must be selected. Table 6-4 on page 6-9 shows the AT Com-mands used to set the CS options.

1=NETWORK OPT.

2=DTE OPTIONS 1=DTE RATE

1=LOCAL 2=CONNECTOR TYPE

3=DATA FORMAT

3=CONFIG ENTER 4=DTE CMD OPTION

2=REMOTE ADDRESS 5=TRANSMIT CLOCK 1=FORCED ON 1=CS DELAY SHORT

2=FOLLOWS RS 2=CS DELAY LONG

6=CS OPTIONS 3=FOLLOWS CD

7=ANTI-STREAM 4=FOLLOWS RS+CD 1=CS DELAY SHORT

8=CD OPTIONS 2=CSDELAY LONG






Specified times for the short and long delays at the different operatingspeeds are shown in Table 6-5.

Table 6-4. CS options AT Commands

FrontPanel

ATCmd.

Description

1=FORCED ON &R0 CS always on

2=FOLLOWS RS &R1 CS state same as RS state

3=FOLLOWS CD &R2 CS state same as CD state

4=FOLLOWS RS+CD &R3 CS state same as RS and CD state

For Follows RS options, select the length of the delay.

1=CS DELAY SHORT _D0 Short delay from RS to CS selected

2=CS DELAY LONG _D1 Long delay from RS to CS selected

Table 6-5. Short and Long Delays at Different Operating Speeds

Rate Short Delay Long Delay

64 1.1ms 16.1ms

56 1.1ms 16.1ms

19.2 1.5ms 16.5ms

4.8 1.5ms 16.5ms

2.4 1.5ms 16.5ms



Anti-Stream

The ANTI-STREAM option is used to select the anti-stream timeout. Figure6-7 shows the menu path used to access the ANTI-STREAM options menu.The anti-stream timeout is the maximum time the DSU III DBU transmitsdata into the network from the DTE. This feature prevents one DTE deviceon a multi-drop network from continuously tying up the transmit circuitback to the master DSU.

The anti-stream timer is reset to zero when RS changes to the active stateand is updated every second while RS is active. When the anti-stream tim-eout expires, the DSU III DBU stops transmitting DTE data into the net-work but continues to accept data from it. This condition exists until theDTE deactivates the RS input.

Figure 6-7. Anti-Stream Options

The factory default setting is TIMER OFF. Table 6-6 on page 6-11 shows theavailable options and their AT commands.

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE

2=DTE OPTIONS 3=DATA FORMAT

4=DTE CMD OPTION

1=LOCAL 5=TRANSMIT CLOCK 1=TIMER OFF

6=CS OPTIONS 2=TIME 10 SEC.

3=CONFIG 7=ANTI-STREAM 3=TIME 30 SEC.

2=REMOTE ENTER ADDRESS 8=CD OPTIONS 4=TIME 60 SEC.






CD Options

The CD OPTIONS menu is used to select the control mode for the receiveline signal detector (CD) lead. The default factory setting is NORMAL; seeFigure 6-8.

Figure 6-8. Selecting CD Options

Table 6-7 on page 6-12 shows the equivalent AT commands for setting CDoptions.

Table 6-6. Anti-StreamAT Commands

FrontPanel

ATCommand

Description

1=Timer Off %T0 Anti-stream timer disabled

2=Time 10 Sec. %T1 Timeout equals 10 seconds



1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE

2=DTE OPTIONS 3=DATA FORAMT

4=DTE CMD OPTION

1=LOCAL 5=TRANSMIT CLOCK

6=CS OPTIONS

3=CONFIG 7=ANTI-STREAM 1=FORCED ON

2=REMOTE ENTER ADDRESS 8=CD OPTIONS 2=NORMAL






Data Terminal Ready (TR) Options

The TR OPTIONS menu is used to select the DSU III DBU response to thedata terminal ready (TR) lead. The factory default setting is IGNORED; seeFigure 6-9.

Figure 6-9. Selecting Data Terminal Ready (TR) Options

Table 6-8 on page 6-13 shows the equivalent AT commands for setting TRoptions.

Table 6-7. CD Options AT Commands

FrontPanel

ATCommand

Description

1=FORCED ON &C0 On all the time

2=NORMAL &C1 On only when data present on loop

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE


4=DTE CMD OPTION

1=LOCAL 5=TRANSMIT CLOCK

6=CS OPTIONS

3=CONFIG ENTER 7=ANTI-STREAM

2=REMOTE ADDRESS 8=CD OPTIONS 1=IGNORED

9=TR OPTIONS 2=COMMAND SWITCH

A=SR OPTIONS 3=NO DBU IF OFF

B=SECONDARY RATE

3=TEST OPTIONS

4=DIAL OPTIONS

5=MANUAL



Data Set Ready (SR) Options

The SR OPTIONS menu is used to select the operating mode for the data setready (SR) lead. Use Shift + A to activate the SR OPTIONS submenu; pressEnter to enter the SR OPTIONS submenu. The factory default setting is OFF

TEST ONLY (shown in Figure 6-10).

Figure 6-10. Setting Data Set Ready (SR) Options

Table 6-9 on page 6-14 shows the AT commands for setting SR options.

Table 6-8. TR Options AT Commands

FrontPanel

ATCommand

Description

1=IGNORE &D0 Ignore the TR input

2=COMMAND SWITCH &D2 Switch to command state if TR is off

3=NO DBU IF OFF &D3 No dial backup if TR is off

1=DTE RATE

1=NETWORK OPT. 2=CONNECTOR TYPE

3=DATA FORMAT

2=DTE OPTIONS 4=DTE CMD OPTION

5=TRANSMIT CLOCK

1=LOCAL 6=CS OPTIONS

7=ANTI-STREAM

3=CONFIG ENTER 3=TEST OPTIONS 8=CD OPTIONS 1=FORCED ON

2=REMOTE ADDRESS 4=DIAL OPTIONS 9=TR OPTIONS 2=OFF OOS ONLY

5=MANUAL A=SR OPTIONS 3=OFF TEST ONLY

B=SECONDARY RATE 4=OFF TEST +OOS



Secondary Rate

The SECONDARY RATE option is used to select the operating speed for thesecondary channel if the secondary channel option was selected duringsetup of the NETWORK OPTIONS. See Figure 6-11.

Use Shift + B to activate the secondary rate submenu. The factory defaultis OFF.

Figure 6-11. Setting the Secondary Rate

Table 6-9. SR Options AT Commands

FrontPanel

ATCommand

Description

1=FORCED ON &S0_C1 Always on

2=OFF OOS ONLY &S1_C1 Off when network out of service

3=OFF TEST ONLY &S0_C0 Off for test only

4=OFF TEST+OOS &S1_C0 Off for test and OOS

1=NETWORK OPT.

1=DTE RATE

2=CONNECTOR TYPE


4=DTE CMD OPTION

5=TRANSMIT CLOCK

1=LOCAL 6=CS OPTIONS 1=OFF

7=ANTI-STREAM 2=75

3=CONFIG 8=CD OPTIONS 3=150

2=REMOTE ENTER ADDRESS 9=TR OPTIONS 4=300

A=SR OPTIONS 5=600

B=SECONDARY RATE 6=1.2K

7=2.4K

3=TEST OPTIONS

4=DIAL OPTIONS

5=MANUAL



Table 6-10 shows the equivalent AT commands for setting the secondaryrate option.

Table 6-10. Secondary Rate AT Commands

FrontPanel

ATCommand

Description

1=OFF _Y0 No secondary channel selected

2=75 _Y1 Secondary chanel rate: 75 bps

3=150 _Y2 Secondary channel rate: 150 bps



6=1.2K _Y5 Secondary channel rate: 1200 bps

7=2.4K _Y6 Secondary channel rate: 2400 bps




Chapter 7 Configuring Test Options

TEST OPTIONS

The TEST OPTIONS menu enables or disables different test modes and spec-ifies the maximum test time allowed. Table 7-1 shows the AT commandsfor setting the Test options.

Table 7-1. Test Options AT Commands

FrontPanel

ATCommand

Description

Enter Timeout S18=x Specify 0 - 255 second test timeout

RDL Ignored &T5 RDL request from remote DSU ignored

RDL Accepted &T4 RDL request accepted

EIA LLB Disabled _A0 Responds to local loopback

EIA LLB Enabled _A1 No response to local loopback

EIA RLB Disabled _R0 No response to remote loopback

EIA RLB Enabled _R1 Responds to remote loopback


Chapter 7. Configuring Test Options

Test Timeout

The TEST TIMEOUT option sets the length of time a DSU III DBU remains ina test mode before automatically returning to the data mode. Enter thetimeout in two-digit decimal value. The factory default setting is off (0).Figure 7-1 shows the menu path used to access TEST TIMEOUT.

Figure 7-1. Setting Test Timeout Option

Remote Digital Loopback (RDL)

The RDL option specifies whether or not the DSU III DBU responds to anRDL request from the far end of the circuit. The factory default setting isRDL ACCEPTED. Figure 7-2 shows the menu path for the RDL option.

Figure 7-2. Remote Digital Loopback

1=NETWORK TYPE

2=DTE OPTIONS

1=LOCAL 1=TEST TIMEOUT

3=TEST OPTIONS 2=RDL EN/DIS

3=EIA LLB EN/DIS 1=DISABLED

3=CONFIG 4=EIA RLB EN/DIS 2=ENABLED

2=REMOTE ENTER ADDRESS 5=DBU ANS.TEST

4=DIAL OPTIONS

5=MANUAL

1=NETWORK TYPE

2=DTE OPTIONS

1=TEST TIMEOUT 1=RDL IGNORED

3=TEST OPTIONS 2=RDL EN/DIS 2=RDL ACCEPTED

1=LOCAL 3=EIA LLB EN/DIS

4=EIA RLB EN/DIS

3=CONFIG 5=DSU ANS. TEST


5=MANUAL



EIA LLB

The EIA LLB (Electronics Industries Association local loopback) optionspecifies whether or not the DSU III DBU responds to the local loopbackinput from the DTE. The factory default setting is DISABLED. Figure 7-3shows the menu path used to access the EIA LLB option.

Figure 7-3. EIA Local Loopback Options

EIA RLB

The EIA RLB (remote loopback) option specifies whether or not the DSU IIIDBU responds to the RLB input from the DTE. The factory default settingis DISABLED. Figure 7-4 shows the menu path for the EIA RLB options.

Figure 7-4. EIA Remote Loopback Options

1=NETWORK TYPE

2=DTE OPTIONS



3=CONFIG 3=EIA LLB EN/DIS 1=DISABLED

2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 2=ENABLED

5=DBU ANS. TEST

4=DIAL OPTIONS

5=MANUAL

1=NETWORK TYPE

2=DTE OPTIONS



3=CONFIG 3=EIA LLB EN/DIS

2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 1=DISABLED

5=DBU ANS. TEST 2=ENABLED

4=DIAL OPTIONS

5=MANUAL



DBU Answer Test

The dial backup connection can be tested while data is passing on theDDS. In order for this test to be performed, DBU ANSWER TEST must beenabled on the remote unit. If DBU ANSWER TEST is not enabled, the re-mote unit will not accept a DBU test from the other end.

Figure 7-5. DBU Answer Test Option

1=NETWORK TYPE

2=DTE OPTIONS



3=CONFIG 3=EIA LLB EN/DIS

2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 1=DISABLED

5=DBU ANS. TEST 2=ENABLED

4=DIAL OPTIONS

5=MANUAL


Chapter 8 Configuring Dial Options

DIAL OPTIONS

The DIAL OPTIONS menu stores up to ten phone numbers, defines the dialbackup operation when the DDS circuit fails, and programs the passcodesecurity feature of the DSU III DBU.

Figure 8-1 on page 8-2 shows the full DIAL BACKUP OPTIONS (4=Dial Op-tions) menu. Shaded items are restricted to the specified DBU version.


Chapter 8. Configuring Dial Options

Figure 8-1. Dial Backup Options

STORED NUMBER TO

1=PHONE NUMBER EDIT: (1-10) NNNNNNN

ISDN Dial Backup

EDIT

STORED NUMBER 9 NUMBER NNNNNNN

EDIT LOC

STORED NUMBER 10 DIRECTORY NUM NNNNNNN

1=AUTOMATIC DBU 1=DISABLED

2=ENABLED

2=NUMBER TO DIAL 1=DBU WITH #1

3=CONFIG 4=DIAL OPTIONS 2=DBU WITH #2

3=ORIGIN/ANSWER 1=DBU ORIGINATE

2=DBU ANSWER

4=WHEN OOS 1=DISABLED

2=ENABLED

2=DBU OPTIONS 5=NO RS SGNL 1=DISABLED

2=ENABLED

6=NO SEAL CUR. 1=DISABLED

2=ENABLED

7=WHEN ALL 1s/0s 1=DISABLED

2=ENABLED

8=AUTO RESTORE RESTORE TIMER

(0=OFF): 1 MIN

9=REDIAL COUNTER ENTER REDIAL

COUNT: 5

A=FAIL TIMER AUTO DBU FAIL

TIME: 3X10 SEC

B=WAIT TO REDIAL WAIT TO REDIAL

TIME: 10 SEC

2-Wire & 4 Wire Dial Backup

C=NETWORK TYPE 1=AT&T/MCI/OTHER

2=US SPRINT

V.2332 bis andV.34 Dial Backup

1=BUFFERED

C=ERROR CONTROL 2=DIRECT

3=RELIABLE MNP

4=AUTO MNP

5=RELIABLE V.42 1=DISABLED

6=REL. V.42/MNP 2=XON/XOFF

7=AUTO V.42/MNP 3=CTS ONLY

D=FLOW CONTROL 4=RTS/CTS

5=UNI. XON/XOFF

1=DISABLED

E=COMPRESSION 2=ENABLED

ISDN Dial Backup

1=AT&T 5ESS

C=SWITCH TYPE 2=NT DMS-100

3=NATIONAL ISDN1

1=ENABLE

3=DBU PASSCODE 2=ENTER CODE



Phone Number

The DSU III DBU stores up to ten numbers of 36 digits each. Edit a phonenumber by reentering the entire number. This process overwrites the pre-viously stored number. Figure 8-2 shows the menu path used to accessthe PHONE NUMBER option.

Figure 8-2. Editing Stored Phone Numbers

ISDN Dial Backup

Table 8-1 on page 8-4 shows the AT Commands available for the PHONE

NUMBER options.

If a clear channel 64 kbps circuit is required to back up the DDS circuit,placing a #4 at the end of the SMART dial string (phone number enteredinto stored number 1-8) establishes the backup connection at 64 kbps in-stead of 56 kbps. For example: 2059718000#4.

Setting the Service Profile Identifier (SPID)

For ISDN dial backup, the service profile identifier (SPID) is stored inSTORED NUMBER 9. The SPID is a sequence of digits identifying ISDN ter-minal equipment to the ISDN switch when more than one ISDN set hasbeen attached to the same central office line. The SPID is assigned by thetelco when the ISDN line is installed and normally resembles the phonenumber.

1=NETWORK TYPE

2=DTE OPTIONS

1=LOCAL 3=TEST OPTIONS

STORED NUMBER

ENTER 1=PHONE NUMBER TO EDIT: (1-10) NNNNNNN

3=CONFIG 2=REMOTE ADDRESS 4=DIAL OPTIONS

2=DBU OPTIONS EDIT SPID

5=MANUAL 3=DBU PASSCODE STORED NUMBER 9 NUMBER NNNNNNN

EDIT LOC

DIRECTORY

STORED NUMBER 10 NUM NNNNNNN



Only the AT&T 5ESS switch is capable of recognizing a point-to-point con-figuration, eliminating the need for a SPID. All other switch types requirea SPID.

Setting the Local Directory (LOC) Number

For ISDN dial backup, the LOC is stored in STORED NUMBER 10.

DBU Options for All Models

The DBU OPTIONS are used to select the modes of operation for the DIAL

BACKUP features. There are ten standard options available with additionaloptions for specific backup services. Table 8-2 on page 8-7 lists the DBUoptions and their AT commands for all models.

Automatic DBU

The AUTOMATIC DBU option specifies whether the unit automatically en-ters dial backup mode or waits for manual setup. The factory default set-ting is DISABLE.

Number to Dial

The NUMBER TO DIAL option offers a selection of stored numbers for theunit to automatically dial. If the leased line fails, and the DSU III DBU isset to originate, it dials the numbers (in chronological order) specified un-der this option to set up the dial backup line. The factory default setting isDIAL STORED #1.

Table 8-1. AT Commands for Storing Phone Numbers

ATCommand

Description

&Zn= Store Phone Number

&Z9= Enter SPID Number for ISDN dial backup

&Z10= Edit LOC for ISDN dial backup



Originate/Answer

This option specifies whether the DSU III DBU originates or waits to an-swer if the dedicated circuit fails. One end must be set to ORIGINATE andthe other to ANSWER. The factory default setting is ANSWER.

When Out of Service (OOS)

When enabled, the DSU III DBU enters backup mode if an out-of-servicecondition is detected. The factory default setting is ENABLE.

No Receive (RX) Signal

When enabled, the DSU III DBU enters backup mode when a loss of signalis detected. The factory default setting is ENABLE.

No Sealing Current

When enabled, the DSU III DBU enters backup mode when a loss of seal-ing current is detected. The factory default setting is ENABLE.

When all 1s/0s

When this option is enabled, the DSU III DBU monitors the receive datafor strings of 1s or 0s that are longer than the Fail Timer. If this conditionis detected, the local DSU III DBU initiates a handshake routine with theremote unit to determine if the DTE is generating the constant data patternor if the network has failed.

Auto Restore

Once the DDS circuit is restored, the DSU III DBU remains in backup untilthe DDS circuit is active for the length of time specified for the restore tim-er. The selection is entered in minutes (up to 255). If set to 0, the DDS mustbe restored manually. The factory default setting is 1 MINUTE.

RESTORE TIMER(0=OFF) __ __ MIN



Redial Counter

This option sets the number of times the DSU III DBU redials the far endwhen entering backup mode. The redial count, which is manually en-tered, can be up to a maximum of 99 attempts. If the DSU III DBU encoun-ters a busy or reorder, it attempts to establish the call the specified numberof times. The factory default setting is 5.

Fail Timer

This option sets the amount of time the dedicated circuit failure conditionmust be active before the DSU III DBU attempts backup. The amount oftime, which is manually entered, can be up to a maximum of 99 seconds.The factory default setting is 3 seconds.

Wait to Redial

This option works in conjunction with the preceding REDIAL COUNTER. Itselects the amount of time between redial attempts to connect the backupline. The amount of time, which is manually entered, can be up to a max-imum of 99 seconds. The factory default setting is 10 seconds.

ENTER REDIALCOUNT: __ __

AUTO DBU FAILTIME: __ __ SEC

WAIT TO REDIALTIME: __ __ SEC



Table 8-2. DBU OptionsAT Commands for All Models

DBU Options ATCMD

Description

Automatic DBU

1=Disabled _K0 Automatic DBU disabled

2=Enabled _K1 Automatic DBU enabled

Number to Dial

1=DBU with #1 _B0 Dial stored #1

2=DBU with #2 _B1 Dial stored #2

Originate/Answer

1=DBU Originate _E0 Originates call if DDS fails

2=DBU Answer _E1 Answers call if DDS fails

When Out of Service (OOS)

1=Enabled _G1 DBU when OOS

2=Disabled _G0 No DBU for OOS

No Receive (RX) Signal

1=Enabled _H1 DBU when RX signal absent

2=Disabled _H0 No DBU when RX signal absent

No Sealing Current

1=Enabled _I1 DBU when sealing current absent

2=Disabled _I0 No DBU when sealing current absent

When all 1s/0s

1=Disabled _P0 No DBU when all 1s/0s detetected

2=Enabled _P1 DBU when all 1s/0s condition exists

Auto Restore S31=x Sets restore timer

Redial Counter S57=x Sets redial counter

Fail Timer S58=x Sets fail timer

Wait to Redial S59=x Sets time between redial attempts



DBU Options for 2-wire and 4-wire

Network Type

This option selects the company providing the switched digital service.When US Sprint is selected, an automatic echo canceler suppressor tone isemitted by the DSU III DBU when dialing. Options include: AT&T/MCI/OTHER and US SPRINT.

DBU Options for V.32 bis and V.34

Table 8-3 on page 8-9 shows the equivalent AT commands for setting ER-ROR CONTROL, FLOW CONTROL , and COMPRESSION options.

Error Control

This option determines the type of error control to be negotiated at thestart of a V.32 bis or V.34 modem connection. The factory default settingis AUTO V.42/MNP.

Flow Control

This option is used to select the type of flow control used by the V.32 bisor V.34 modem. The factory default setting is CTS ONLY.

Compression

This option is used to select V.42 bis data compression for V.32 bis or V.34operation when running asynchronously. When enabled, data through-put speeds as high as 57.6 kbps may be achieved. For synchronous appli-cations, the speed is limited to a maximum of 14.4 kbps for the V.32 and28.8 kbps for the V.34. The factory default setting is ENABLED.



Table 8-3. DBU Options AT Commands for V.32 bis and V.34 Backup

DBU Options ATCMD

Description

Error Control

1=Buffered \N0 Normal operation. No error control. Allowsspeed matching, buffering, and flow control.

2=Direct \N1 Direct operation. No error control, no buffer, andno flow control.

3=Reliable MNP \N2 Reliable MNP operation. Uses MNP errorcontrol.

4=Auto MNP \N3 Auto-Reliable MNP operation. Tries MNP errorcontrol first; uses normal operation if necessary.

5=Reliable V.42 \N4 Reliable V.42 (LAPM) operation. Uses V.42(LAPM) error control. If V.42 (LAPM) error controlcannot be used the call is disconnected.

6=Rel. V.42/MNP \N5 Reliable V.42 (LAPM) or MNP operation. Useseither V.42 (LAPM) or MNP error control. Ifneither can be used the call is disconnected.

7=Auto V.42/MNP \N6 Auto-Reliable V.42 (LAPM) or MNP operation.Tries to use V.42 (LAPM) error control first, andMNP error control next. If neither can be used,then Normal operation is used.

Flow Control

1=Disabled \Q0 Flow control disabled

2=XON/XOFF \Q1 Enables XOn/XOff flow control

3=CTS Only \Q2 Enables CTS flow control from DCE

4=RTS/CTS \Q3 Enables CTS flow control from DCE and RTSfrom DTE

5=UN. XON/XOFF \Q4 Unidirectional XOn/XOff

Compression

1=Disabled %C0 Compression disabled

2=Enabled %C1 Compression enabled



DBU Options for ISDN

Switch Type

This option selects the type of telco CO switch providing the ISDN service.There are three options for ISDN switch types:

• AT&T 5ESS• NT DMS-100• National ISDN1

DBU Passcode

The dial backup passcode adds an additional level of security to the DSUIII DBU. A passcode of one to ten characters can be programmed into theunit.

When a dial backup connection is established, the originate unit transmitsa pre-programmed passcode to the answer unit over the dial backup con-nection before the connection is considered valid. The answer unit com-pares the received passcode to a pre-programmed passcode. If thepasscode matches, the receive unit sends a Passcode OK message to theoriginate unit and goes on-line. If the passcode does not match, the receiveunit sends an Invalid Passcode message to the originate unit and termi-nates the dial backup connection. If a passcode is not received by an an-swer unit with passcode enable, or if the Passcode OK message is notreceived by an originate unit with passcode enable, the dial backup con-nection is terminated.


Chapter 9 Dial Options

DIAL OPTIONS

The dial options available in the DIAL menu (4=Dial) vary whether theDSU III DBU is currently in dial backup mode or connected to the DDS line(see Figure 9-1 ).

Figure 9-1. Dial Options Menu

1=DIAL BACKUP COMMAND ACCEPTED

Originate Unit Connected to DDS Line

1=DIAL BACKUP 1=DIAL STORED Select Stored Number 1-A

2=ENTER DIAL # NNNNNNN

2=STAY ON LEASED

3=DBU ONLINE TEST

4=DIAL

During Dial Backup

1=HANG UP

2=STAY ON LINE


Chapter 9. Dial Options

Answer Unit Connected to DDS Line

Dial Backup

The message COMMAND ACCEPTED is displayed and the DSU III DBUwaits for an incoming call. When an incoming call is detected the DSU IIIDBU answers the call and enters dial backup.

Originate Unit Connected to DDS Line

Dial Backup

The DSU III DBU prompts to dial a stored number or enter a number todial for dial backup.

Stay on Leased

The DSU III DBU remains on the leased line and does not enter dial back-up mode.

DBU Online Test

This option allows the dial backup connection to be tested manually with-out interrupting the data on the DDS. A stored or manually entered num-ber can be used.

Dial Options During Dial Backup

Hang Up

Terminates the dial backup connection and attempts to reestablish com-munication on the DDS line.

DBU ANSWER TEST must be enabled on the far end to perform aDBU on-line test.



Stay On Line

This DSU III DBU remains in dial backup mode and returns to the MAIN

menu.




Chapter 10 Status

STATUS

The status selection displays two lines of the current operational status ofthe network and the DTE interfaces.

After 30 seconds of no front panel operation the DSU III DBU automatical-ly reverts to the STATUS display; see Figure 10-1.

Figure 10-1. Status Display

Network Rate, DTE Rate, and Data Format

This display line (see Figure 10-1) indicates the current loop rate on thefirst line. The DTE data rate and format (as selected in configuration) areshown on the second line.

1

1

1

1

DTE & LOOP

LOOP 64KDTE 9.6K SYNC

SW56 DBU STATUSOPEN LOOPUNIT IN TESTOPEN LOOP

Test being performed

Network RateDTE Rate/Data Format

Dial Backup ModeDial Backup Status

DSU Operational StatusDDS Network Status

This screen only displayed during test.


Chapter 10. Status

Dial Backup Information

Type of Dial Backup Service

This display line (see Figure 10-1 on page 10-1) indicates the type of dialbackup service installed in the DSU III DBU. The following messages aredisplayed according to the dial backup option installed in the DSU IIIDBU:

Current Status of Dial Backup Mode

This display line (see Figure 10-1 on page 10-1) indicates the backup ser-vice status. Possible messages include the following:

DU DBU Status 2-wire Switched 56 backup option installed.ISDN DBU Status 1 B+D Basic Rate ISDN backup option installed.SW56 DBU Status 4-wire Switched 56 backup option installed.V.32 DBU Status V.32 backup option installed.V.34 DBU Status V.34 backup option installed.DBU Status No backup service option card installedNot Installed in the DSU III DBU unit.

Answering Call The DSU III DBU detected an incoming callmessage and is initiating call setup procedure.

Call Disconnect Call disconnect message received from theremote end.

Called Unit Busy The unit called is currently busy and cannot beconnected (ISDN only).

Dialing The unit is dialing the selected number.Going to DBU The DSU III DBU is entering dial backup mode.Idle Messages are not being transmitted but the

service is immediately available for use.Incoming Call Incoming call messages being received.In Dial Backup The DSU III DBU is currently in dial backup

mode.


Chapter 10. Status

DSU Operation and Network Status

Current DSU III DBU Status

This display line (see Figure 10-1 on page 10-1) indicates current DSU IIIDBU status. Possible messages are:

No RX Signal Sealing current detected but no data signalreceived from telco.

No wink from CO Switched 56 provider encountered a serviceproblem (4-Wire SW56 only).

Not Installed No dial backup option installed in the DSU IIIDBU.

OOS/OOF From Net Out-of-service signal or out-of-frame conditionexists. The call cannot be completed because thecalled terminal or the called terminal's accessline is out of service or is faulty (2-wire and 4-wire SW56 only).

Open Loop The physical connection to the backup line hasbeen broken (2-wire and 4-wire SW56 only).

DBU Line in RDL Remote end initiated a test.Test From Telco The network provider has activated the CSU

loopback (2-wire and 4-wire SW56 only).DBU Test Pattern The DSU III DBU is currently performing a test

with a pattern.Waiting for Call The originating DSU III DBU is waiting on a call

from the remote end.

Data Mode In data mode, the data set ready (SR) and request tosend (RTS) circuits are on, and the DSU III DBU is readyto send data.

Unit in Test The DSU III DBU is currently in test mode, use theArrows to scroll through the menus to display the typeof test being performed.


Chapter 10. Status

Current DDS Network Status

This display line (see Figure 10-1 on page 10-1) displays the status of themain telco line. For normal operation this should display LOOP IS NOR-MAL, other possible messages are described as follows:

DTE Control Leads and Status

Four additional DTE interface leads are displayed with their current status(on or off) displayed below. The leads are identified as follows:

Answering Call The DSU III DBU detects an incoming call.Check Telco The transmit and receive (Tx/Rx) pairs of the

loop connection are reversed. The pairs shouldbe swapped for normal operation.

Going To DBU This message is displayed briefly while switchingfrom the dedicated service to dial backup mode.

In Dial Backup The DSU is in dial backup mode.LL Test From Telco An LL test has been initiated from the telco.Loop is Normal The DSU is connected to the dedicated line.OOS/OOF The telco is transmitting an out-of-service code.Open Loop The DDS physical connection has been broken.Waiting for Call The DBU module is waiting for a call.

TR Data terminal ready

SR Data set ready

LLB Local loopback

RLB Remote loopback.


Chapter 11 Testing and Troubleshooting

TEST OVERVIEW

The DSU III DBU performs a variety of diagnostic functions that isolateportions of the circuit to identify the problem source. Tests may be initiat-ed and terminated from the front panel or the DTE interface. In asynchro-nous mode, AT commands can control the testing from the DTE interface.For synchronous operation, V.25 bis commands can provide test control.

The unit also responds to standard DDS network tests initiated from telcotest centers. In addition, it can run several tests such as local and remoteloopbacks to aid in problem isolation.

Figure 11-1. Normal Operation Before Initiating Loopback Test

All diagnostic tests disrupt data flow.

LOCALDSU/CSU

REMOTEDSU/CSUDTE DTE

RD

TD

Rx

Tx

Rx

Tx

Rx

Tx

Rx

Tx

RD

TD TELCO


Chapter 11. Testing and Troubleshooting

Initiating a Test

Initiate tests using the following procedure:

1. Select TEST from the MAIN menu by pressing 2 and then pressingEnter.

2. Specify LOCAL, REMOTE, or DBU testing by selecting the correspond-ing number, followed by Enter.

3. Use the up and down arrows to view test options.4. Select a test from the available options by pressing the corresponding

number, followed by Enter.

The example in Figure 11-2 shows the menu path for initiating a local DTEAND LOOP test.

Figure 11-2. Initiating a Test

Once a test is initiated, Please Wait is displayed briefly followed by thestatus screen.

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP

1=LOCAL UNIT 5=TEST PATTERN

6=SELF TEST

2=TEST 2=REMOTE UNIT ENTER TEST UNIT

ADDRESS:0

3=DBU CONNECTION DIAL STORED #

ENTER DIAL #



Test Status Display

The TEST STATUS display appears automatically during a test. The TEST

STATUS display is similar to the status screen described in the chapter Sta-tus on page 10-1, with additional prompts for the type of test and the num-ber of errors (for tests with a test pattern).

Figure 11-3 shows an example of a TEST STATUS display for a test with atest pattern.

Figure 11-3. Sample Test Status Displays

Exiting a Test

During a test, press Quick to access the EXIT TEST/DISPLAY STATUS menuor press Cancel to return to the MAIN menu. The EXIT TEST/DISPLAY STA-TUS menu provides the following options, which are available only after atest has been initiated (see Figure 11-4 on page 11-4):

Exit Test Exits the current test and returns to the MAIN menu.Display Status Reenters test display.

TEST PATTERNTST ERR = 00

LOOP 56KDTE 56K SYNC

TR SR LLB RLBOFF OFF OFF OFF

UNIT IN TESTLOOP IS NORMAL

While this menu is on the display:Press 1 to clear errors. Press 2 to inject an error.

Use the Up and Down arrows to display other status screens.



Figure 11-4. Complete Test Menu

1=DTE & LOOP (LL) STATUS DISPLAY 1=EXIT TEST

2=DISPLAY STATUS

1=EXIT TEST

2=LOOP ONLY (RT) STATUS DISPLAY 2=DISPLAY STATUS

1=EXIT TEST

3=DTE ONLY STATUS DISPLAY 2=DISPLAY STATUS

1=2047 PATTERN

2=511 PATTERN 1=EXIT TEST

3=STRESS PTRN #1 STATUS DISPLAY 2=DISPLAY STATUS

4=DTE WITH TP 4=STRESS PTRN #2

5=STRESS PTRN #3

6=STRESS PTRN #4

1=2047 PATTERN

2=511 PATTERN

3=STRESS PTRN #1 1=EXIT TEST

5=TEST PATTERN 4=STRESS PTRN #2 STATUS DISPLAY 2=DISPLAY STATUS

5=STRESS PTRN #3

1=LOCAL UNIT 6=STRESS PTRN #4

6=SELF TEST STATUS DISPLAY

1=2047 PATTERN

2=511 PATTERN

2=TEST 2=REMOTE UNIT ENTER TEST UNIT 3=STRESS PTRN #1 1=EXIT TEST

ADDRESS:0 4=STRESS PTRN #2 STATUS DISPLAY 2=DISPLAY STATUS

5=STRESS PTRN #3

6=STRESS PTRN #4

7=DATA FROM DTE

3=DBU CONNECTION DIAL STORED # 1=EMPTY

2=EMPTY

ENTER DIAL # 3=EMPTY

4=EMPTY

5=EMPTY

6=EMPTY

7=EMPTY

8=EMPTY

9=EMPTY

A=EMPTY



TROUBLESHOOTING

This section is intended to provide a quick and easy means of diagnosingsuspected problems associated with local or remotely attached ADTRANDSU/CSUs.

Messages from the DSU/CSU

Messages on the LCD display and LEDs display information concerningthe status of the unit and the local loop. If the Alarm LED is On, one ormore of the messages shown in Table 11-1 is displayed on the LCD.

The STATUS menu must be selected in order for the unit todisplay status messages. Pressing Quick returns to the MAINmenu where STATUS can be selected.

Table 11-1. Messages from the DSU/CSU

Message Meaning Probable Cause Action

LOOP IS NORMAL Good local loop signalbeing received fromthe telco.

Indicates good localloop.

No action required; unitproperly connected totelco circuit.

OPEN LOOP Unit not receiving asignal from the telco.

Bad telco cable fromthe DSU to telco jack orbad circuit to telco.

Replace telco cablefrom DSU to wall jack.If a problem persists,contact telco provider.

NO RX SIGNAL Unit detects sealingcurrent but no datasignal from telco

Bad conductor in telcocable from DSU to telcojack or bad circuit totelco.

Replace telco cablefrom DSU to wall jack.If a problem persists,contact telco provider.

OOS/OOF_FROM NET Unit detects an out-of-service or out-of-framecondition from thetelco.

Telco is havingproblems with DDScircuit or remote unit isturned off ordisconnected.

Check remote unit.Contact telco serviceprovider.

CHECK TELCO LINE Transmit/receive pairreversal detected.

Telco wall jack wiredincorrectly.

Switch wire pairs in walljack or contact telcoservice provider.

TEST FROM TELCO Telco activated aloopback to test theDDS circuit.

Telco is testing circuit. Wait until test iscomplete or contacttelco service provider.



Troubleshooting New Installs

Before initiating diagnostics on a newly installed unit and/or DDS circuitand before contacting ADTRAN Technical Support, please check the itemsin Table 11-2 to ensure the unit is configured properly.

After verifying the items listed in Table 11-2 the unit should operate prop-erly and display the following:

If a status message other than DATA MODE LOOP IS NORMAL is shown,begin performing diagnostics described in the section Test Sequence forTroubleshooting New Installs or Existing Circuits on page 11-7.

DATA MODELOOP IS NORMAL

Table 11-2. Troubleshooting New Installs

ConfigurationItem to Check

Option Selection Action

DTE Type RS-232 or V.35 Select the type of DTE interface option to connect to the DSU/CSU from the configuration menu.

Loop Rate Auto, 2.4 to 64 kbps Select the DDS loop rate of the DDS circuit from theconfiguration menu.

Data Format Async or Sync Select the type of data to be used from the configurationmenu.

DTE Cable N/A Verify DTE cable connection to the proper DTE connector onthe DSU/CSU.

Telco Cable N/A Verify the telco cable is securely connected to the DSU/CSUand wall jack.

Power the unitOff and then On.

N/A Verify the unit passes self test during power-up (displayed onthe LCD).



Test Sequence for Troubleshooting New Installs or Existing Circuits

If your DSU is suspected of having problems, perform a SELF TEST to de-termine if the unit is in good health.

If your DSU is receiving excessive errors requiring retransmission of data,first perform a DTE WITH TEST PATTERN to determine if the unit's internaltransmitter and receiver is operating error free. If problem persists, per-form a REMOTE TEST to verify the connection between the local and remoteunit is error free. Run the test using all available test patterns.

• DTE & Loop Test

• DTE Only Test

• Loop Only Test

If the unit fails any of these tests or the problem has not been determined,contact ADTRAN Technical Support; see the back of this manual.

If an external BERT tester is available, these additional tests maybe performed:



LOCAL UNIT DIAGNOSTICS

The local DSU III DBU can perform six different tests; see Table 11-3.

The test patterns shown in Table 11-4 on page 11-9 are available for theDTE WITH TEST PATTERN and TEST PATTERN tests.

Table 11-3. Test AT Commands

FrontPanel

Display

ATCommand

Description

DTE & Loop (LL) &T10 TD/RD and RX/TX Loopbacks

Loop Only (RT) &T11 RX/TX Loopback at DTE Interface

DTE Only &T1 TX/RX Loopback at Network Interface

DTE with TP &T8 TX/RX Loopback with Test Pattern

Test Pattern &T9 Transmit/Receive Test Pattern

Self Test Z Check Internal Components (Resets Unit)

Exit Test &T0 Stops test, returns to data mode

TD = Customer Transmit DataRD = Customer Receive DataTX = Network Transmit DataRX = Network Receive Data



Table 11-4. DTE With Test Pattern Commands

FrontPanel

ATCommand

Description

1=2047 PATTERN _T0&T8 Standard 2047 random datapattern.

2=511 PATTERN _T1&T8 Standard 511 random data pattern.

3=STRESS PTRN #1 _T2&T8 Stress pattern with alternating highand low ones densities. Repeatedpattern of 100 octets: 1111 1111,followed by 100 octets: 0000 0000.

4=STRESS PTRN #2 _T3&T8 Stress pattern with alternatingmedium and low ones densities.Repeated pattern of 100 octets:0111 1110, followed by 100 octets:0000 0000.

5=STRESS PTRN #3 _T4&T8 Stress pattern with medium onesdensity. Continuous series ofoctets: 0011 0010.

6=STRESS PTRN #4 _T5&T8 Stress pattern with low onesdensity. Continuous series ofoctets: 0100 0000.



DTE & Loop (LL)

Test Description

The DTE & LOOP test splits the DSU III DBU into two separate DTE andloop interface sections and then loops the receive data of each interfaceback to its respective transmit data. The DTE & LOOP test provides a bidi-rectional loopback at the DSU/CSU. Figure 11-5 illustrates the loopbackpoints and the signal paths for this test.

Figure 11-5. DTE & Loop Test

Test Purpose

The DTE & LOOP test is used for the following purposes:

• Verify integrity of the DTE interface and cable.• Provide a loopback for network tests.

LOCALDSU/CSUDTE

Rx

Tx

Rx

Tx

Rx

Tx

TELCO

DTE Loopback Local 4-wire Loopback



Initiating

Follow the menu path outlined in Figure 11-6 to initiate a DTE & LOOP test.

Figure 11-6. Initiating a DTE & Loop Test

Interpreting Test Results

A BERT tester must be used to interpret the test results of a DTE & LOOP

test.

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP


6=SELF TEST

2=TEST 2=REMOTE UNIT

3=DBU CONNECTION



Loop Only (RT)

The LOOP ONLY (RT) test allows the loop interface and a major portion ofthe DTE interface for the local DSU III DBU to be tested from the remotesite over the actual communication circuit. Figure 11-7 illustrates the loop-back point and the signal paths for this test.

Figure 11-7. Loop Only Test

Test Purpose

The LOOP ONLY test is used to provide a loopback for network tests.

Initiating

Follow the menu path outlined in Figure 11-8 on page 11-13 to initiate aLOOP ONLY test.

LOCALDSU/CSU

Rx

Tx

Rx

Tx

TELCO

Local 4-wire Loopback

DTEInterface



Figure 11-8. Initiating a Loop Only Test


The LOOP ONLY test is used for the purpose of looping the DDS circuit backto the telco. No test results are available from the local DSU III DBU.

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP


6=SELF TEST


3=DBU CONNECTION



DTE Only

The DTE ONLY test provides a method for testing both the DTE interfacedrivers and receivers of the local DSU III DBU plus its loop transmitter andreceiver. For this test, the loop transmit data is connected to the loop re-ceive data at a point close to the physical network interface. This test canbe used to verify proper operation between the local DTE and the localDSU III DBU.

Figure 11-9. DTE Only Test Diagram

Test Purpose

The DTE ONLY test is used for the following purposes:

• Verify integrity of the DTE interface.• Verify integrity of connection between DTE and DSU III DBU.

Initiating

Follow the menu path outlined in Figure 11-10 on page 11-15 to initiate aDTE ONLY test.

When this test is implemented, the far unit receives an OOS/OOF message from the network and enters an alarm state.

DTELOCAL

DSU/CSU

Rx

Tx

Rx

Tx

RD

TD



Figure 11-10. Initiating a DTE Only Test


A BERT tester must be used to interpret the test results of a DTE ONLY test.

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP


6=SELF TEST


3=DBU CONNECTION



DTE With Test Pattern

The DTE WITH TP (test pattern) test is similar to the DTE ONLY test de-scribed previously except the test pattern is generated using the DSU/CSU internal test pattern generator. This test can be used to detect defi-ciencies within the internal drivers and receivers of the DSU III DBU. Fig-ure 11-11 illustrates the loopback point and the data paths for this test.

Figure 11-11. DTE with Test Pattern

Test Purpose

A DTE test using a test pattern is used for the following purposes:

• Verify integrity of the DTE interface.• Verify integrity of connection between DTE and DSU III DBU.

Initiating

Follow the menu path outlined in Figure 11-12 on page 11-17 to initiate aDTE TEST WITH TEST PATTERN.

DTE

LOCALDSU/CSU

Rx

Tx

Rx

Tx

Rx

Tx

Test PatternGenerator

ErrorInject

Test PatternDetector

ErrorClear



Figure 11-12. Initiating a DTE Test with Test Pattern


If the unit is functioning properly, the DSU III DBU displays:

The first line of the display indicates the type of test being performedwhile the second line of the display indicates the number of errors accu-mulated by the test pattern detector.

If errors occur during this test, the test error count can be reset to zero bypressing 1. To verify proper operation of this test, single bit errors can beinjected into the transmitted test pattern by pressing 2. These errors ap-pear on the TEST ERR display.

1=DTE & LOOP (LL) 1=2047 PATTERN

2=LOOP ONLY (RT) 2=511 PATTERN

3=DTE ONLY 3=STRESS PTRN #1


1=LOCAL UNIT 5=TEST PATTERN 5=STRESSPTRN #3

6=SELF TEST 6=STRESS PTRN #4


3=DBU CONNECTION

DTE WITH TPTST ERR=XX



Test Pattern

The TEST PATTERN option converts the local DSU III DBU into a BERTtester for the purpose of testing the DDS circuit. If this test is used, the re-mote DSU/CSU must be in loopback or transmitting a test pattern. Figure11-13 illustrates the data paths for this mode.

Figure 11-13. Test Pattern Only

Test Purpose

Testing using a test pattern is used for the following purposes:

• Transmits user-selected test pattern using an internal test pattern gen-erator, and compares the received data using internal test pattern de-tector to detect if there are any errors on the DDS circuit.

• Injects errors and verifies the unit transmits data across the communi-cation circuit to the remote unit.

• Helps determine from which direction the circuit is receiving errors.

LOCALDSU/CSU

Rx

Tx

Rx

Tx TELCO


ErrorInject


ErrorClear

REMOTEDSU/CSU

Rx

Tx

Rx

Tx


ErrorInject


ErrorClear



Initiating

Follow the menu path outlined in Figure 11-14 to initiate a test using a testpattern.

Figure 11-14. Initiating a Test Using a Test Pattern


If the unit is functioning properly, the test error count should be 0.

1=DTE & LOOP (LL) 1=2047 PATTERN

2=LOOP ONLY (RT) 2=511 PATTERN

3=DTE ONLY 3=STRESS PTRN #1


1=LOCAL UNIT 5=TEST PATTERN 5=STRESSPTRN #3

6=SELF TEST 6=STRESS PTRN #4


3=DBU CONNECTION



Self Test

The SELF TEST verifies current operation of the DSU III DBU. It can be per-formed at any time and is recommended if there is any question about theDSU's health.

Test Purpose

The purpose of this test it to determine if the DSU is functioning properly.

Initiating

Follow the menu path outlined in Figure 11-15 to initiate a test using a testpattern.

Figure 11-15. Initiating a Self Test


Once SELF TEST is activated, the LEDs cycle on and off as the system runsthe self test. A pass or fail status will be displayed on the LCD along witha checksum indicating the current firmware revision.

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP


6=SELF TEST


3=DBU CONNECTION



REMOTE UNIT DIAGNOSTICS

A remote DSU III DBU can perform seven different tests; see Table 11-5.

The REMOTE UNIT submenu allows a remotely installed DSU to be placedinto loopback. There are six test patterns to choose from or DATA FROM

DTE may be selected.

Figure 11-16. V.54 RDL with Test Pattern

Test Purpose

The test purpose is to test the local DSU, the DDS circuit, and the remoteDSU.

Table 11-5. Remote Tests and AT Commands

FrontPanel

ATCommand

Description

1=2047 PATTERN _T0&T7 Standard 2047 random data pattern

2=511 PATTERN _T1&T7 Standard 511 random data pattern

3=STRESS PTRN #1 _T2&T7 DDS Stress Pattern #1




7=DATA FROM DTE &T6 Data from DTE

DTE

LOCALDSU/CSU REMOTE

DSU/CSU

Rx

Tx

Rx

Tx

Local Unit Initiates Test

Rx

Tx TELCO


ErrorInject


ErrorClear

Rx

Tx

Rx

Tx



Initiating

Follow the menu path outlined in Figure 11-17 to place a remote DSU IIIDBU into loopback.

Figure 11-17. Initiating a Remote Test

After selecting REMOTE UNIT from the menu, the following prompt is dis-played for entering the address for the remote unit:

Use the number keys to type the address of the remote DSU, then press En-ter. The test pattern selections are displayed. After a test pattern is select-ed, the system briefly displays Please Wait.

Test Results

If the test is successful the status menu is displayed. If not, Unable to Execute Test is displayed.


If the unit is functioning properly, the test error count should be 0.

1=2047 PATTERN

1=LOCAL UNIT 2=511 PATTER

2=TEST ENTER TEST UNIT 3=STRESS PTRN #1

2=REMOTE UNIT ADDRESS:0 4=STRESS PTRN #2

5=STRESS PTRN #3

3=DBU CONNECTION 6=STRESS PTRN #4

7=DATA FROM DTE

Enter Test UnitAddress:XX



DBU CONNECTION

When the DSU III DBU is equipped with a dial backup option, the DBUCONNECTION option appears as one of the TEST menu selections. This testallows the dial backup network to be tested while data is transmitted onthe main line.

When this option is selected, choose a stored number or enter a number todial. After establishing DBU connection, the DSU III DBU designated atthe answer unit is placed into loopback and a test pattern is transmittedfrom the originate unit to the answer unit. Receive data is checked for er-rors and the results displayed on the front panel. While running this test,errors may be injected by pressing 2 and cleared by pressing 1. During theDBU test the LEDs scan back and forth and the Test LED is On.

Figure 11-18. DBU Connection Test

Test Purpose

The purpose of this test is to verify the DBU circuit and DBU modules inboth the local and remote DSU III DBU are functioning properly.

When running at a subrate over a 56k or 64k loop (or a 64k loopwith Scrambler activated), the DSU will not send data during aDBU test.

The DBU ANSWER TEST option must be enabled. EnablingDBU ANSWER TEST does not affect the unit during dial backup.

DTE

Answer Orig

DDSDTE

DBU DBU

DDS

Switched

LOCALDSU/CSU

REMOTEDSU/CSU



Initiating

Follow the menu path outlined in Figure 11-19 to place a remote DSU IIIDBU into loopback.

Figure 11-19. Initiating a DBU Connection Test


If the unit is functioning properly, the DSU III DBU displays:

1=LOCAL UNIT 1=98376113

2=TEST 2=REMOTE UNIT 2=EMPTY

3=EMPTY

3=DBU CONNECTION DIAL STORED # 4=EMPTY

5=EMPTY

ENTER DIAL # 6=EMPTY

7=EMPTY

8=EMPTY

9=EMPTY

A=EMPTY

DBU TEST PATTERNTST ERR = 0000


Chapter 12 Manual Command

MANUAL COMMAND

The MANUAL COMMAND option is a shortcut method for entering configu-ration and control commands for the DSU III DBU.

The first display prompts the user to enter the command number.

COMMAND:00

Figure 12-1 on page 12-2 shows the menu path for manual command. Theavailable manual commands are listed in Table 12-1 on page 12-3.


Chapter 12. Manual Command

Figure 12-1. Manual Command

Use the number keys to enter the hexadecimal command number. PressEnter to complete. Once the command number is entered, the displayshows both the command number and the present value or setting for thecommand. The command value can be edited or reissued with the existingvalue.

Use the number keys to enter the hexadecimal value. Press Enter to com-plete. The system briefly displays Command Accepted and returns to theactive menu.

1=NETWORK OPT.

1=LOCAL 2=DTE OPTIONS

3=TEST OPTIONS

3=CONFIG ENTER 4=DIAL OPTIONS

2=REMOTE ADDRESS COMMAND:00

5=MANUAL COMMAND COMMAND:00 VALUE:00

COMMAND: XXVALUE: 00



Table 12-1. Manual Commands

Command Description Command Value

AT Command Echo

Disable 82 00

Enable 82 01

AT Result code

Enable 85 00

Disable 85 01

AT Long or Short code

Short form (Numeric) 86 00

Long form (Verbose) 86 01

AT Escape Character 2 00 to FF

AT CR Character 3 00 to FF

AT LF Character 4 00 to FF

AT BS Character 5 00 to FF

AT Escape Char. Timer 0C 00 to FF

Abort Call Timer 7 00 to FF

DTR Recognize Delay 19 00 to FF

DTR Initiated Command Timeout 28 00 to FF

Load Factory Opt.

Option Set #1 8A 00

Option Set #2 8A 01

Option Set #3 8A 02

Option Set #4 8A 03

Network Address Lock

Network Addr. Unlock C3 00

Network Addr. Lock C3 01

Front Panel En/Dis

Disable AA 00

Enable AA 01




AppendixA AT Commands

Table A-1 shows the AT commands available for the DSU III DBU.

Table A-1. AT Commands

Command Title DefaultA/ Re-execute Command noneATA Answer noneATDn Dial Number noneATE Echo Command 1ATH Hang Up Call noneATO Go Online noneATQn Result Code Display 0ATSn? Read S-Register noneATSn=x Write to S-Register noneATVn Result Code From Firmware 1ATZ Self Test noneAT&Cn DCD Option 0AT&Dn DTR Option 0AT&Fn Restore Factory Options noneAT&Kn Flow Control noneAT&Ln Network Type 0AT&Qn DTE Data Format 0AT&Rn CS Options 0AT&Sn SR Options 0AT&Tn Test Commands 0AT&V View Current Configuration noneAT&Xn Transmit Clock 0AT&Zn=x Store Phone Number none

61200037L1-20 DSU III DBU User Manual A-1

Appendix A. AT Commands

Command Title DefaultAT\Nn MNP Option (V.32 DBU) 0AT\Tn Inactivity TimerAT%Bn Loop Rate Select 0AT%Cn Compress Option (V.32 DBU) 0AT%Kn DTE Rate SelectAT%P Password Control 0AT%P=x Password Entry 0T%P>x Password Verify 0AT%Rx Initiate Remote Config.AT%Tn Anti-stream Option 0AT_An LLB Control 0AT_Bn DBU Number to Dial 0AT_Cn SR Control During Test 0AT_Dn RTS-CTS Delay 0AT_En DBU Originate/Answer 0AT_Fn Scrambler Control 0AT_Gn DBU When OOS 0AT_Hn DBU When No RX Signal 0AT_In DBU When No Sealing Current 0AT_Jn Auto Answer Enable/Disable 0AT_Kn DBU Enable/Disable 0AT_Ln DTE Routing Main/Backup 0AT_N=xx Set Network Address noneAT_Pn Front Panel Enable/Disable 0AT_RR LB Enable/Disable 0AT_S=xx Set Serial Number noneAT_Tn Select Test Pattern 0AT_Xn Clock Source Select 0AT_Yn Secondary Channel Rate Select 0AT&T10 Local DTE & Loop noneAT&T11 Local Loop Only noneAT&T1 Local DTE Only none

Table A-1. AT Commands (Continued)

A-2 DSU III DBU User Manual 61200037L1-20


Command Title DefaultAT&T8 Local DTE with TP noneAT&T9 Local Test Pattern noneAT&T0 Exit Test noneAT_T0&T7 Remote test using 2047 pattern noneAT_T1&T7 Remote test using 511 pattern noneAT_T2&T7 Remote test using stress PTRN #1 noneAT_T3&T7 Remote test using stress PTRN #2 noneAT_T4&T7 Remote test using stress PTRN #3 noneAT_T5&T7 Remote test using stress PTRN #4 noneAT_T0&T8 Local test using 2047 pattern noneAT_T1&T8 Local test using 511 pattern noneAT_T2&T8 Local test using stress PTRN #1 noneAT_T3&T8 Local test using stress PTRN #2 noneAT_T4&T8 Local test using stress PTRN #3 noneAT_T5&T8 Local test using stress PTRN #4 noneAT&T6 Remote test using data from DTE none

Table A-1. AT Commands (Continued)

61200037L1-20 DSU III DBU User Manual A-3


A-4 DSU III DBU User Manual 61200037L1-20

AppendixB Default Configuration Profiles

The DSU III DBU contains four different user profiles (sets of configura-tions options) stored in read-only memory; see Table B-1 on page B-2. Theunit is shipped from the factory with profile 1 loaded into the nonvolatileconfiguration memory. See the chapters Installation on page 2-1 and Man-ual Command on page 12-1 for more information.

Profile 1

Profile 1 is configured for a 56 kbps, synchronous, point-to-point or dial-up operation with a V.35 connector. Automatic DBU has been disabled forthis configuration profile.

Profile 2

Use profile 2 for a 56 kbps, asynchronous, point-to-point or dial-up opera-tion, with an EIA-232 connector. Automatic DBU has been disabled forthis configuration profile.

Profiles 3 and 4

Profiles 3 and 4 are used for enabling dial backup using two DSU III DBUunits. One unit must be set for Answer and the other for Originate. Useprofile 3 to set the remote unit to Answer and profile 4 to set the host unitto Originate.

61200037L1-20 DSU III DBU User Manual B-1

Appendix B. Default Configuration Profiles

Table B-1. Default Configuration Profiles

Profile Numbers

(00) 1 (01) 2 (02) 3 (03) 4

Manual Command

Escape Character 43=2BH 43=2BH 43=2BH 43=2BH

CR Character 13=0DH 13=0DH 13=0DH 13=0DH

LF Character 10=0AH 10=0AH 10=0AH 10=0AH

BS Character 8 8 8 8

DBU Abort Call Timer 50=32H 50=32H 50=32H 50=32H

Escape Guard Timer 50=32H 50=32H 50=32H 50=32H

Command Echo Enable Enable Enable Enable

Result Code Enable Enable Enable Enable

Long or Short Code Long Long Long Long

Test Pattern Type 2047 2047 2047 2047

CS Delay Short Short Short Short

DTR Recog. Delay (x100ms) 3 3 3 3

DTR Command Timeout (x100) 8 8 8

Front Panel En/Dis Enable Enable Enable Enable

Inactivity Timer Off Off Off Off

AT Password Control Disable Disable Disable Disable

Network Options

Loop Rate AUTO AUTO AUTO AUTO

Network Address 0 0 0 0

Remote Conf. En/Dis Enable Enable Enable Enable

Clock Source From Network From Network From Network From Network

DTE Options

Remote DSU Address 0 0 0 0

DTE Rate (56k loop) 56k/57.6k 56k/57.6k 56k/57.6k 56k/57.6k

Scrambler Mode OFF OFF OFF OFF

Connector Type V.35 RS232 V.35 V.35

DTE Data Format SYNC ASYNC SYNC SYNC

DTE Command Options DIS DIS DIS DIS

Transmit Clock Normal Normal Normal Normal

CS Options Follow RS Follow RS Follow RS Follow RS

Anti-stream Timer Timer Off Timer Off Timer Off Timer Off

CD Option Normal Normal Normal Normal

TR Options Ignored Ignored Ignored Ignored

SR Options Off Test+OOS Off Test+OOS Off Test+OOS Off Test+OOS

Secondary Channel Rate OFF OFF OFF OFF

Test Options

Test Timeout Off Off Off Off

RDL En/Dis RDL Accepted RDL Accepted RDL Accepted RDL Accepted

EIA Controlled LLB Disable Disable Disable Disable

B-2 DSU III DBU User Manual 61200037L1-20


EIA Controlled RLB Disable Disable Disable Disable

DBU Answer Test Disable Disable Disable Disable

Dial Options

Automatic DBU Disable Disable Enable Enable

DBU Number to Dial #1 #1 #1 #1

DBU Originate/Answer Answer Answer Answer Originate

DBU when OOS Enable Enable Enable Enable

DBU when No RX Signal Enable Enable Enable Enable

DBU when No Sealing Current Enable Enable Enable Enable

DBU Auto Restore Timer 1 minute 1 minute 1 minute 1 minute

DBU Redial Counter 5 5 5 5

DBU Fail-Timer (x10 seconds) 3 3 3 3

DBU Redial Wait Time 10 10 10 10

When all 1s/0s Disable Disable Disable Disable

Network Type AT&T AT&T AT&T AT&T

Error Control Auto V.42/MNP Auto V.42/MNP Auto V.42/MNP Auto V.42/MNP

Flow Control (V.32) CTS Only CTS Only CTS Only CTS Only

Data Compression (V.32) Enabled Enabled Enabled Enabled

Table B-1. Default Configuration Profiles (Continued)

Profile Numbers

(00) 1 (01) 2 (02) 3 (03) 4

61200037L1-20 DSU III DBU User Manual B-3


B-4 DSU III DBU User Manual 61200037L1-20

AppendixC DSU to Modem Interconnect

MODEM TAIL CIRCUIT APPLICATION

A DSU to modem interconnect diagram for a modem tail circuit applica-tion is shown in Figure C-1.

Figure C-1. DSU to Modem Interconnect

MODEM

DSUIII

RC

ETC

RD

TD

DCD

RTS

ETC

RC

TD

RD

RTS

DCD

For Multi-drop requirement:

61200037L1-20 DSU III DBU User Manual C-1

Appendix C. DSU to Modem Interconnect

C-2 DSU III DBU User Manual 61200037L1-20

AppendixD EIA-232 Connector

56 AND 64 KBPS APPLICATION

The EIA-232 connector, shown in Figure D-1, may be used for 56 and 64kbps applications. Using the External Clock option and this cable shouldeliminate data errors caused by excessive delays in the DTE transmit clockreceiver and transmit data driver. When creating this cable at the DTE in-terface EIA-232 connector, tie the transmit clock lead (TC) to the externaltransmit clock lead (ETC) as shown.

Figure D-1. EIA-232 Connector

EIA-232 CONNECTOR

Pin 15

Pin 24

TC

ETC

(No connection)

DSU III DBUDTE

61200037L1-20 DSU III DBU User Manual D-1

Appendix D. EIA-232 Connector

D-2 DSU III DBU User Manual 61200037L1-20

AppendixE Specifications Summary

SPECIFICATIONS AND FEATURES

This section describes the standard specifications and features incorporat-ed in the DSU III DBU.

Operating Modes

Data Rates

DTE Rates

DTE Interface Data RatesV.35 and EIA-232: up to 57.6 kbps async, up to 64 kbps sync

FCC ApprovalFCC part 15, class A and Part 68

DTE InterfacesBoth EIA-232 and V.35 electrical and physical DTE interfaces

Dedicated DDS: Point-to-point and multipoint

Switched Backup: (Automatic or manual) 4-wire Switched 56, 2-wireSwitched 56, V.32 bis/V.42 bis, or ISDN (1B+D)

Dedicated mode service rates: 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps

Switched mode service rate: 56 kbps and 64 kbps

DTE-to-loop rate matching in both dedicated and switched modes

Synchronous rates: 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64

Asynchronous rates: 2.4, 4.8, 9.6, 19.2, 38.4, and 57.6 kbps

61200037L1-20 DSU III DBU User Manual E-1

Appendix E. Specifications Summary

Data BufferingInternal slack buffer

Clocking

Diagnostics

Line Requirements

Line Interface

Receiver Sensitivity-45dB at all rates

Environment

Normal DDS or private network tributary

(slaved to network receive clock)

Private network master (internal clock)

Private network master (slaved to external clock)

Network: CSU and DSU loopbacks

User: Local DTE and loop, remoteV.54

Test Patterns: 2047, 511, DDS, and stress patterns 1-4

Loop transmission parameters as defined in:

AT&T PUB 62310: Dedicated DDS

AT&T PUB 41468: Switched 56

SPRINT TS 0046: Switched 56

RJ-48S, 4-wire, full duplex

Backup as applicable

Operating Temperature: 0 to 50 OC (32 to 122 OF)

Storage Temperature: -20 to 70 OC (-4 to 158 OF)

E-2 DSU III DBU User Manual 61200037L1-20


Physical

Power115 VAC, 60 Hz, 8 W

Relative Humidity: Up to 95%, non-condensing

Dimensions: 2.25"H, 8.75"W, 10.25"D

Weight: 3 lbs

61200037L1-20 DSU III DBU User Manual E-3


E-4 DSU III DBU User Manual 61200037L1-20

AppendixF Glossary

2047A pseudorandom test pattern that is repeated every 2047 bits; used totest DSU/CSUs.

511A pseudorandom test pattern that is repeated every 511 bits; used totest DSU/CSUs.

2-Wire Switched 56A Northern Telecom proprietary 56 kbps switched digital data serviceoffered by telco service providers and delivered to users over a singlepair of copper wires.

4-Wire Switched 56An AT&T proprietary 56/64 kbps switched digital data serviceoffered by telco service providers and delivered to users over fourcopper wires.

AT&T Publication 41458An AT&T specification titled "Special Access Connections to theAT&T Communications Network," used to design compatibility intoDSU/CSU products.

AT&T Publication 62310An AT&T specification titled "Digital Data System Channel InterfaceSpecification," used to design compatibility in DSU/CSU products.

61200037L1-20 DSU III DBU User Manual F-1

Appendix F. Glossary

BERTBit error rate test. A known pattern of bits is transmitted and theerrors received are counted to figure the bit error rate. The idea is tomeasure the quality of data transmission. The bit error rate is theratio of received bits that are in error, relative to the number of bitsreceived. Usually expressed in a power of 10.

CDCarrier Detect. A signal generated by a modem or DSU/CSU. CDindicates its connection status. If the CD light is on, the device isspeaking to another device.

channel service unitCSU. A DCE device used to connect a digital phone line (T1 orSwitched 56 line) coming in from the phone company to either a mul-tiplexer, a channel bank, or directly to another device producing adigital signal (for example a digital PBX, a PC, or data communica-tions device). A CSU performs certain line-conditioning and equal-ization functions, and responds to loopback commands sent from thecentral office. A CSU regenerates digital signals. It monitors themfor problems, and provides a way of testing the digital circuit.

clockingAn oscillator-generated signal that provides a timing reference for atransmission link. A clock provides signals used in a transmissionsystem to control the timing of certain functions. The clock has twofunctions: (1) to generate periodic signals for synchronization and (2)to provide a time base.

control portAn interface to a device or system that allows users to issue com-mands pertaining to dialing, configuration, diagnostics, manage-ment, etc.

CPECustomer premise equipment. All telecommunications terminalequipment located on the customer premises, including telephonesets, private branch exchanges (PBXs), data terminals, and customer-owned coin-operated telephones.

F-2 DSU III DBU User Manual 61200037L1-20


CSSee CTS.

CSUSee Channel Service Unit.

CSU loopbackA telco initiated test which loops the CSU portion of the DSU/CSUback to the telco and allows the telco to test the DDS circuit as well asthe CSU portion of the customer's DSU/CSU.

CTSClear to send. A signal on the DTE interface indicating that the DCEis clear to send data. Sometimes referred to as CS.

data compressionA technique for encoding information so that fewer data bits arerequired to represent a given amount of data. Compression facilitatesthe transmission of more data for a given amount of transmissiontime and circuit capacity. It also reduces the amount of memoryrequired for data storage.

data service unitDSU. A device designed to transmit and receive digital data on digi-tal transmission facilities.

DDSDataphone Digital Service also called Digital Data System. A privateline digital service for transmitting data end-to-end at speeds of 2.4,4.8, 9.6, and 56 kbps and in some cases 19.2, 38.4, or 64 kbps. The sys-tems can use central hub offices for obtaining test access, bridginglegs of multipoint circuits, and cross connecting equipment. DDS isoffered on an inter-LATA basis by AT&T and on an intra-LATA basisby the Bell operating companies.

DDS Stress Patterns 1-4A series of test patterns designed to test DDS circuits. Each pattern isdesigned to stress the DDS circuit in a particular manner to assure itsreliability.



DSUSee data service unit.

DSU loopbackA telco initiated test which loops the DSU back to the telco and isused to test the DDS circuit as well as the DSU/CSU.

DTEData terminal equipment. In the EIA-232C standard specification, theEIA-232C is connected between the DCE and a DTE. The main differ-ence between the DCE and the DTE is that pins two and three arereversed.

DTE to loop rate matchingA feature designed into ADTRAN DSU/CSU products that allowsslower DTE devices to communicate over 56/64 kbps digital circuits.

DTR-dialingData terminal ready. A control signal sent from the DTE to the DCEthat indicates the DTE is powered on and ready to communicate.DTR dialing allows a DSU/CSU to dial a predetermined numberwhen DTR goes high.

EIA-232CA set of standards specifying various electrical and mechanical char-acteristics for interfaces between computers, terminals, and modems.Defines the mechanical and electrical characteristics for connectingDTE and DCE data communications devices. It defines what theinterface does, circuit functions, and their corresponding connectorpin assignments. The standard applies to both synchronous andasynchronous binary data transmission.

EIA-366AAn EIA interface standard for autodialing.

FCC Part 15 of Class ARadiated and conducted emissions standards set for commercial andindustrial use.



FCC Part 15 of Class BRadiated and conducted emissions standards set for residential use.

FCC Part 68FCC rules and regulations intended to provide protection of the tele-phone network from harm caused by connection of equipment to thenetwork.

in-bandSignaling (dialing, diagnostics, management, configuration, etc.) overthe same channel used for data.

ISDNIntegrated Services Digital Network. A network architecture thatenables end-to-end digital connections. The network supportsdiverse services through integrated access arrangements and definesa limited set of standard, multipurpose interfaces for equipment ven-dors, network providers, and customers. Interworking with a publicswitched telephone network is retained.

local DTE and loop testA test initiated by the user that loops the DSU to the central office andback. This is used to test the local DSU's DTE and local loop.

multidropA communications arrangement in which multiple devices share acommon transmission channel, although only one may transmit at atime.

out-of-bandSignaling that is separated from the channel carrying information(voice, data, video, etc.). Typically the separation is accomplished bya filter. The signaling includes dialing and other supervisory signals.

private network tributary clockingClocking in which the timing is derived from the DDS loop.

private network master clockingClocking in which timing is derived internally from the DSU.



private network master - slaved to external clockClocking in which timing is slaved to the DSU's external transmitclock.

PSTNPublic switched telephone network. A direct distance dialing tele-phone network that is available for public use. The network is anintegrated system of transmission and switching facilities, signalingprocessors, and associated operations support systems that is sharedby customers. PSTN also is called public network, public switchednetwork, or public telephone network.

point-to-pointA private circuit, conversation, or teleconference in which there is

one person at each end, usually connected by some dedicated trans-mission modem.

RDLRemote digital loopback.

remote configurationA feature designed into ADTRAN DSU/CSU products that allow aremote DSU/CSU to be configured from a local DSU/CSU or VT 100compatible terminal.

remote V.54 testA diagnostic feature that allows testing of the DDS circuit by loopingthe remote DSU/CSU back to the local DSU/CSU.

RJ-45SRegistered jack. 8-pin connector used for data transmission overstandard telephone wire. Single line, 2-wire T/R, PR/PC, pro-grammed data, 8 position, keyed.

scramblerA device that transposes or inverts signals, or otherwise encodes amessage at the transmitter, to make it unintelligible at a receiver notequipped with an appropriately set descrambling device.



serviceThe provision of telecommunications to customers by a common car-rier, administration, or private operating agency, using voice, data,and/or video technologies.

SNMPSimple Network Management Protocol. A control and reportingscheme widely used to manage devices from different vendors.SNMP operates on top of the Internet protocol.

SRData set ready. A signal on the EIA-232 interface that indicates ifcommunication is connected and ready to start handshaking controlsignals so communication can begin.

switchedIn regards to DSU/CSUs, the ability to perform the functions ofestablishing and releasing connections on a per call basis betweentwo or more circuits, services or communications systems. The DSUIII S2W and DSU III S4W are examples of Switched 56 DSU/CSUs.

tail circuitA feeder circuit, which may be digital or analog, that provides anaccess line to a digital or analog network.

U interfaceA twisted-pair subscriber loop carrying an ISDN 160 kbps digital sig-nal between the ISDN central office and the NT1 at the customer pre-mises.

ULUnderwriters Laboratories. A laboratory established by the NationalBoard of Fire Underwriters that tests equipment, materials, and sys-tems that may affect insurance risks, with special reference to firedangers and other hazards to life.

UL 1459A UL rating that assures the connected equipment (DSU/CSU) pro-vides protection from current overloads and power line crosses.



V.25 bisAutomatic calling and answering command set including the abilityto work with async, bisync and HDLC devices. Provides a small sub-set of the functions of the Hayes¨ Standard AT Command Set.

V.32 bisHigher speed CCITT standard for full-duplex transmission on two-wire leased and dial-up lines at 4.8, 7.2, 9.6, 12, and 14.4 kbps. Theydo not rely on compression to achieve that high speed.

V.34Latest high-speed CCITT standard for full-duplex transmission ontwo-wire leased and dial-up lines at the following rates: 2.4, 4.8, 7.2,9.6, 12, 14.4, 16.8, 19.2, 21.6, 24, 26.4, and 28.8 kbps without compres-sion. The maximum connection rate between two V.34 modems is28.8 kbps. Occasionally, connections occur at 26.4, 24, and 21.6 kbpsbecause line quality differs from one call to the next.

V.FC (V. Fast Class)Proprietary modulation scheme developed by Rockwell Internationalfor data communication speeds up to 28.8 kbps.

VT 100A non-intelligent terminal or terminal emulation mode used for asyn-chronous communications.


Index

Numerics1B+D basic rate ISDN 1-42047 F-12-Wire Switched 56 1-3, F-14 F-14-Wire Switched 56 1-34-Wire switched 56 F-1511 F-1

AAll 1s or all 0s condition 1-5, 8-5Answer

Call 10-2, 10-4Anti-stream 6-10

Factory default 6-10AT commands 2-7, 11-1

Clear to send (CS) 6-9DTE

Rate 6-2Phone number 8-4

AT&T 5ESS 8-10AT&T Publication 41458 F-1AT&T Publication 62310 F-1Auto DBU fail 8-6Automatic DBU 8-4Auxiliary EIA-232 3-7

BBERT F-2

CCall disconnect 10-2Cancel 3-2, 3-5Carrier detect (CD) 3-6, 6-11Channel service unit F-2Check telco 10-4Clear to send (CS) 3-6, 6-8

commands 6-9Clock source 5-5Clocking F-2commands

ta set ready (SR) 6-14Compression 8-8Configuration 3-2

Dial backup 8-1Local 4-1Methods 2-7Network options 5-1Test options 7-1

Configuration DTE options 6-1Configuration local 2-10Configuration remote 2-11Connector

EIA-232 D-1Connector type 6-4

Factory default 6-4Control port F-2CPE F-2CS F-3CSU F-3CSU loopback F-3CTS F-3Customer service 2-1

61202013L1-20 DSU III DBU User Manual Index-9

Index

DData buffering E-2Data compression F-3Data format 6-5

Factory default 6-5Data invert option 6-3Data mode 10-3Data service unit F-3Data set ready (SR) 6-13, 10-4

commands 6-14Factory default 6-13

Data terminal ready (TR) 6-12, 10-4Factory default 6-12

DATAPATH 1-1, 1-3DBU answer test 7-4DBU connection 11-23DBU line in RDL 10-3DBU online test 9-2DBU options

2-wire and 4-wire 8-8All models 8-4ISDN 8-10V.32 bis 8-8

DBU passcode 8-10DBU status 10-2DDS F-3DDS network status 10-4DDS stress patterns 1-4 F-3Diagnostics E-2Dial 3-2Dial backup 9-2

atus information 10-2Configuration 8-1de 9-1ISDN 8-3Mode

Status 10-2Dial options 4-1, 9-1Dial up operation B-1Dialing 10-2

Digital data service (DDS) 1-1, 1-2,1-4, 2-2, 5-5, 9-1Down arrow 3-2DSU F-4DSU loopback F-4DSU status 10-3DSU to modem interconnect C-1DTE F-4DTE & loop (LL) 11-10DTE command option 6-6DTE connectors 3-6DTE control leads 10-4DTE data connection 2-3DTE interface 3-7

rameters 4-1DTE only 11-14DTE options 4-1DTE rate 6-1

commands 6-2Factory default 6-1Same as the network 6-1

DTE to loop rate matching F-4DTR-dialing F-4DU DBU status 10-2

EEIA local loopback (LLB) 7-3EIA remote loopback (RLB) 7-3EIA-232 connector D-1EIA-232 interface 1-1EIA-232C F-4EIA-366A F-4Enter 3-2, 3-4Error control 8-8Exit test 11-3External clock 6-7, D-1

FFail timer 8-6FCC Part 15 of Class A F-4

Index-10 DSU III DBU User Manual 61202013L1-20

Index

FCC Part 15 of Class B F-5FCC Part 68 F-5Flow control

AT commands 8-8Function keys 3-2

GGoing to DBU 10-2, 10-4

HHang up 9-2

IIdle 10-2In dial backup 10-2, 10-4In-band F-5Incoming call 10-2Installation 2-1INV 2-10INVBL 2-10INVBM 2-10INVCU 2-10INVPS 2-10INVPV 2-10ISDN F-5

DBU status 10-2Dial backup 8-3

LLCD

Description 3-6LCD window 3-4LED

Description 3-5line 1 connector 2-2line 2 connector 2-2LL test from telco 10-4Local configuration 4-1Local DTE and loop test F-5

Local loopback 10-4, 11-1Local unit

Test 11-8Loop is normal 10-4Loop only (RT) 11-12Loop rate 3-3, 5-3Loss of sealing current 1-4

MMain menu 3-1, 3-5, 11-3Manual command 4-1, 12-1Menu navigation 3-1Modem tail circuit

plication C-1Multidrop F-5

NNational ISDN1 8-10Network

interface connection 2-2terface parameters 4-1

Network address 5-4Network options 3-3, 4-1, 5-1Network rate 10-1Network type 8-8No DBU installed - DBU status 10-2No receive (RX) signal 1-5, 8-5, 10-3No sealing current 8-5No wink from CO 10-3Not installed 10-3NT DMS-100 8-10Number to dial 8-4Numeric keypad 3-4

OOOS/OOF from net 10-3OOS/OOF from telco 10-4Open loop 10-3, 10-4Operation 3-1, 11-1


Index

Originate 8-5Originate/answer 8-5Out of service (OOS)

gnal 1-4Out-of-band F-5

PPhone number 8-3

AT command 8-4Pin assignments

Line 1 connector 2-2line 2 connector 2-3

Point-to-point F-6Point-to-point operation 6-3, B-1Pon assignments

Primary V.35 connector 2-6Power cord 3-7Power switch 3-7Power up 2-2Primary EIA-232 3-7Primary V.35 3-7Private network master

aved to external clock F-6Private network master clocking F-5Private network tributary clockingF-5PSTN F-6

QQuick 3-5

RRDL F-6Rear panel 3-6Receipt inspection 2-1Receive data 3-6Redial counter 8-6Remote command 2-11

Remote configuration F-6able/disable 5-4

Remote digital loopback (RDL) 7-2Remote loopback 10-4, 11-1Remote V.54 test F-6Restore timer 8-5return material authorization(RMA) xiRJ-45S F-6

SScrambler F-6Scrambler on option 6-3Scrambler on/off

Factory default 6-3Secondary channel 3-6, 6-14

Connection 2-6rvices 3-7

Secondary rate 6-14Factory default 6-14

Self test 11-20Service F-7Shift 3-5SNMP F-7SR F-7Status 3-1, 10-1

DDS network 10-4Dial backup mode 10-2

Stay on leased 9-2Stay on line 9-3SW56 DBU status 10-2Switch type 8-10Switched F-7Synchronous operation 11-1

TTail circuit F-7Telco jack 3-6Test 3-1, 10-4

DTE only 11-14


Index

Self 11-20Test pattern 11-18

Test from telco 10-3Test mode manual 3-6Test options 4-1

Configuration 7-1Test pattern 11-18Test timeout 7-2Transmit clock 6-7, D-1Transmit data 3-6

UU interface F-7UL F-7UL 1459 F-7Unit dialing options 4-1Unit in test 10-3Unit test options 4-1Up arrow 3-2, 3-5

VV.25 bis F-8V.25 bis commands 2-8, 11-1

Asynchronous option 2-9Bi-sync option 2-9SDLC option 2-9

V.32 bis F-8V.32 bis backup option 1-3V.32 bis/42 bis 1-1, 1-3V.32 DBU status 10-2V.34 1-1, 1-4, 2-2, 8-8, F-8

DBU status 10-2V.35 connector 2-3V.FC (V. Fast Class) F-8VALA 2-10VT 100 F-8

WWait to redial 8-6Waiting for call 10-3, 10-4When out of service (OOS) 8-5


Index


Product Support Information

Presales Inquiries and Applications SupportPlease contact your local distributor, ADTRAN Applications Engi-neering, or ADTRAN Sales:

Post-Sale SupportPlease contact your local distributor first. If your local distributor can-not help, please contact ADTRAN Technical Support and have theunit serial number available.

Repair and ReturnIf ADTRAN Technical Support determines that a repair is needed,Technical Support will coordinate with the Customer and ProductService (CaPS) department to issue an RMA number. For informationregarding equipment currently in house or possible fees associatedwith repair, contact CaPS directly at the following number:

Identify the RMA number clearly on the package (below address), andreturn to the following address:

ADTRAN, Inc.CaPS Department6767 Old Madison PikeProgress CenterBuilding #6, Suite 690Huntsville, AL 35807

RMA # _____________

Applications Engineering (800) 615-1176

Sales (800) 827-0807

Technical Support (888) 4ADTRAN

CaPS Department (256) 963-8722

Notes

Documents

Data Service Unit Part Number 1200037L1 Document Number